Shocking 1 Easy Funfetti Cake Mix Sandwich Cookies

Name: Shocking 1 Easy Funfetti Cake Mix Sandwich Cookies
Prep time: 20 min
Cook time: 10 min
Total time: 30 min
Cuisine: American
Ingredients: 1 box funfetti style cake mix 15.25 ounces; 1 large egg; 4 ounces cream cheese softened; ¼ cup unsalted butter melted and cooled; ¾ cup rainbow sprinkles; ½ cup unsalted butter softened (for filling); 2 cups powdered sugar; ¾ teaspoon vanilla extract; 1 to 2 tablespoons whole milk

By Adam Harris on August 31, 2025

Funfetti Cake Mix Sandwich Cookies With Buttercream

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If you’re looking for a party dessert that screams fun but whispers “I’m so easy to make,” then you’ve landed in the right spot, my friend! Seriously, these **Funfetti Cake Mix Sandwich Cookies With Buttercream** are the answer to every last-minute celebration. We’re talking about soft, colorful cookies that taste like they took hours, but sneak peek: they barely take any time at all.

Table of Contents

I know baking from scratch can sometimes feel intimidating, especially when you need something show-stopping. That’s why I live for recipes that use quality shortcuts to give us maximum flavor payoff. This recipe is one of my absolute go-tos because it’s forgiving, cheerful, and always a huge hit. You don’t need fancy techniques here, just a willingness to make something colorful!

Funfetti Cake Mix Sandwich Cookies With Buttercream - detail 1

Why These Funfetti Cake Mix Sandwich Cookies With Buttercream Are Perfect For Beginners

This is probably the easiest recipe in my entire baking repertoire, which is why I always push it on new bakers. We’re starting with a good quality cake mix, which means the complicated dry ingredient ratios are already handled for us. That’s a huge win! The secret to making these **Funfetti Cake Mix Sandwich Cookies With Buttercream** so soft is just a touch of cream cheese in the dough—it keeps them chewy long after they cool down.

My philosophy here is simple: baking should be joyful, not stressful. If you can stir ingredients in a bowl, you can absolutely master these sandwich cookies. They require minimal chilling, no complicated rolling, and the payoff is huge. They look like you spent all day fussing over them, but trust me, you’ll have time to admire your work while they bake!

Gather Your Supplies for Funfetti Cake Mix Sandwich Cookies With Buttercream

Okay, before we dive into the fun part—mixing the dough—let’s make sure your kitchen is ready for action. Since these **Funfetti Cake Mix Sandwich Cookies With Buttercream** come together so fast, having everything out and ready to go is the real secret to speed.

We aren’t talking about a huge arsenal of specialized gear here. Most of this you probably already have lying around, which is part of why this recipe is so great for quick baking sessions. You’ll need bowls for mixing the dough and whipping up that gorgeous filling.

Essential Baking Equipment

A large mixing bowl for the cookie dough base.
A stand mixer or a good hand mixer for whipping up the buttercream—this makes the filling so light!
Two sturdy baking sheets.
Parchment paper or silicone mats—don’t skip this, it helps with cleanup!
A wire cooling rack so the cookies can breathe and cool properly.
A small cookie scoop or a tablespoon for consistent sizing.

Ingredients for Truly Funfetti Cake Mix Sandwich Cookies With Buttercream

The beauty of these **Funfetti Cake Mix Sandwich Cookies With Buttercream** is that they rely on just a few core items, mostly coming right out of that cake mix box! But listen closely, because the state of your butter and cream cheese makes a huge difference in the final texture. Don’t just grab things willy-nilly from the fridge; temperature matters here!

We need two separate sets of ingredients: one for the soft, chewy cookie itself, and one for the fluffy filling that holds it all together. Trust me, if you get the butter right for both parts, you’re halfway to winning the cookie game.

Cookie Base Components

One full box of funfetti style cake mix (that’s about 15.25 ounces, don’t add any extra ingredients the box calls for!).
One large egg.
4 ounces of cream cheese, and this has to be completely **softened** to room temperature so it mixes in smoothly.
¼ cup of unsalted butter, which needs to be **melted and then cooled** down before you add it.
¾ cup of rainbow sprinkles—the more colorful, the better for this recipe!

Creamy Buttercream Filling Components

½ cup of unsalted butter, again, make sure this is **softened**; we need it pale and fluffy later.
2 cups of powdered sugar, sifted if you notice any lumps.
¾ teaspoon of good quality vanilla extract—don’t skimp here!
1 to 2 tablespoons of whole milk, used only as needed to get that perfect spreading consistency.

Step-by-Step: Making the Funfetti Cake Mix Sandwich Cookies With Buttercream

Now for the fun part! This is where we turn simple pantry staples into show-stopping **Funfetti Cake Mix Sandwich Cookies With Buttercream**. The process is so straightforward, but I’m going to walk you through my little tricks so yours come out perfectly soft every time.

Preparing and Baking the Cookie Dough

First things first, let’s get that oven warmed up. Preheat your oven to 350°F right away, and line two baking sheets with parchment paper. I learned the hard way that these cookies can sometimes stick a little, so using parchment is your insurance policy against heartbreak!

In a large bowl, you’re going to combine everything for the dough: the whole box of cake mix, that single egg, the softened cream cheese, and your melted-then-cooled butter. Mix it up! You’re looking for a thick, somewhat stiff dough. It might look a little strange, but trust the process. Don’t overmix it; just mix until it’s combined into a cohesive ball.

Next, the sprinkles! Get your ¾ cup of rainbow sprinkles ready. Scoop your dough into nice, even 1-inch balls. This is important for even baking! Roll each ball gently but thoroughly in the sprinkles until they are fully coated in color. I love seeing that explosion of color before they even hit the oven.

Place the coated dough balls on your prepared sheets, leaving about two inches between them. Then, here’s a little tip: gently press the tops down just slightly with the bottom of a glass or your palm. They won’t spread a ton, so you need to give them a little encouragement to flatten out. Bake these beauties for 9 to 11 minutes. You’re looking for cookies that are set—meaning they don’t look wet in the middle—but they should still look noticeably soft. Pull them out right when they look done, because they firm up as they cool on the rack.

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Creating the Smooth Buttercream Filling

While those cookies are cooling completely—and I mean completely, don’t rush this part—we make the filling. This is where we get that amazing, fluffy texture for our **Funfetti Cake Mix Sandwich Cookies With Buttercream**.

Start with your ½ cup of softened butter in your mixing bowl. Beat that butter by itself for a good 2 to 3 minutes until it looks pale yellow and really light and fluffy. This step incorporates the air we need! Once it’s fluffy, turn the mixer down to low speed. Gradually add in your 2 cups of powdered sugar and the vanilla extract. Let it mix until it’s just combined, scraping down the sides of the bowl.

Now for the milk. Add it slowly, one tablespoon at a time. You might only need one tablespoon, or you might need two. Keep mixing until that frosting is smooth, creamy, and easily spreadable. If it’s too stiff, add a tiny splash more milk. If it seems too loose, beat it a little longer, or add a teaspoon more powdered sugar.

Assembling Your Sandwich Cookies

This is the moment of truth! You absolutely must wait until the cookies are totally cool. If you try to spread buttercream on a warm cookie, you’ll just end up with a soupy, colorful mess, and we don’t want that for our **Funfetti Cake Mix Sandwich Cookies With Buttercream**.

Once cooled, take half of your cookies and spread a generous dollop of that creamy buttercream onto the flat side. You can use a small offset spatula or even a piping bag if you want those pretty swirls! Then, gently top it with another cookie, flat side down, pressing just enough so the filling peeks out the sides. That’s it! Instant party cookies!

Tips for Success with Your Funfetti Cake Mix Sandwich Cookies With Buttercream

Honestly, these cookies are hard to mess up, but there are a couple of little things I’ve learned over the years that take them from “good” to “OMG, what is this magic?” The main thing to remember when making **Funfetti Cake Mix Sandwich Cookies With Buttercream** is patience during the cooling phase. Everything else is pretty straightforward! If you want more easy baking inspiration, check out our soft funfetti cookies.

Also, don’t be afraid to use extra sprinkles when you roll the dough balls. Since the dough is sticky from the cream cheese, the sprinkles adhere really well, and you want that thick, colorful crust all the way around. More sprinkles equal more fun, that’s my rule! You can also find more fun baking ideas on our Pinterest page.

Cooling is Key for Perfect Assembly

I have to stress this point again because it’s the number one reason sandwich cookies fail: the cookies must be completely, totally, 100% cool before you try to fill them. I mean, room temperature cool, not just slightly warm. If there is any residual heat left in those cookies, the room-temperature buttercream filling will immediately start to melt and slide right out when you press the halves together.

If you’re in a rush, you can pop the baked cookies on the cooling rack into the fridge for about 15 minutes, but make sure they aren’t cold to the touch—just cool enough that they don’t feel warm in your hand. Warm cookies mean messy, soupy **Funfetti Cake Mix Sandwich Cookies With Buttercream**, and we want that filling firm and beautiful so it holds its shape when you serve them up! For more tips on easy baking, see our article on 3 ingredient banana bark.

Frequently Asked Questions About Cake Mix Sandwich Cookies

Can I use a different type of sprinkle?

Oh, absolutely! The recipe calls for rainbow sprinkles because they look the most festive, but you can totally customize these! If you’re making them for a holiday, switch to red and green jimmies for Christmas, or pastel colors for Easter. I’ve used chocolate sprinkles for a richer look, and they taste great too. Just make sure you use nonpareils or jimmies—the longer, rod-shaped sprinkles—because sanding sugar tends to fall off the dough balls too easily during baking.

How long will these cookies last?

Because these sandwich cookies rely on cream cheese in the dough and a rich buttercream filling, they are best eaten within the first two days for peak softness. However, if stored correctly in an airtight container, they usually hold up well for about four to five days at cool room temperature. If your kitchen is really warm, you might want to keep them in the fridge, but let them sit out for about 20 minutes before serving so the buttercream softens up again.

Storing Your Funfetti Cake Mix Sandwich Cookies With Buttercream

We want these **Funfetti Cake Mix Sandwich Cookies With Buttercream** to stay soft and vibrant for as long as possible, right? Storing them correctly is key to maintaining that perfect texture we worked so hard to achieve. You definitely don’t want them drying out or getting squished! If you need more baking tips, follow us on Facebook.

The biggest mistake people make is leaving them uncovered on the counter. Once they’re assembled, they need a bit of protection to keep that filling creamy and the edges chewy.

Best Practices for Storing and Reheating

The best way to store these is in a single layer, but let’s be real, who has that much space? If you need to stack them, you must use parchment paper between the layers. This stops the buttercream from sticking to the cookie above it, which would be a total disaster.

For the best results, keep them in an airtight container. Whether they live on the counter or in the fridge depends on how warm your house is. Here’s a quick guide:

Condition	Storage Location	Notes
Room Temperature (Cool Kitchen)	Airtight Container	Up to 3 days for peak softness.
Warm Kitchen or Longer Storage	Refrigerator	Keep between parchment layers. Let sit out 20 mins before eating.

You never really “reheat” cookies like this, but if they’ve been chilled, letting them sit on the counter for a little while brings the buttercream back to its perfect, spreadable texture!

What to Serve With Your Colorful Cookies

These **Funfetti Cake Mix Sandwich Cookies With Buttercream** are so vibrant and sweet, they don’t really need much alongside them, but serving them up with the right drink just completes the party vibe! Since the cookies are already packed with vanilla and fun flavors, you want something simple that cuts through the sweetness slightly. For another fun, sweet treat, check out our recipe for strawberry lemonade cookies.

I always think presentation matters, even if it’s just a casual Tuesday afternoon. A nice stack of these cookies on a bright platter makes them the centerpiece!

Beverage Pairings

Cold Milk: This is the absolute classic pairing for any cookie, but especially one this colorful. Whole milk or even a nice oat milk works perfectly to wash down that buttercream.
Iced Lemonade: If you’re serving these outside on a warm day, the slight tartness of a good, homemade lemonade cuts through the sugar beautifully. It’s refreshing!
Sparkling Water with Lime: For something zero-sugar, a bubbly water with a slice of fresh lime gives you that little zing to balance the sweetness of the **Funfetti Cake Mix Sandwich Cookies With Buttercream**. It feels fancy without being complicated!