Amazing High Protein Egg Bake Casserole

By chef sofia on March 7, 2026

A slice of High Protein Egg Bake Casserole with sausage, spinach, and red peppers, topped with melted cheese.

Ugh, those crazy busy mornings, right? Between getting everyone out the door and just trying to find your keys, a good breakfast can feel like a pipe dream. That’s exactly why I fell head over heels for this High Protein Egg Bake Casserole. It’s my go-to when I know the week is going to be hectic. It’s so simple to whip up, packed with everything you need to power through your day – especially protein! – and the best part? You can make it ahead. Seriously, it’s a lifesaver!

Why You’ll Love This High Protein Egg Bake Casserole

Seriously, this casserole is a breakfast game-changer! Here’s why it’s become a staple in my kitchen:

  • Seriously High Protein: Packed with eggs, cottage cheese, and beef sausage, this dish will keep you full and energized for hours.
  • Flavor Town: The savory sausage, sweet bell peppers, hint of onion, and sharp cheddar cheese create a taste sensation you’ll crave.
  • Meal Prep Magic: Bake it once, and you’ve got breakfasts ready for days. Just slice and reheat!
  • Veggie Powerhouse: Easily customize it with your favorite veggies – spinach, peppers, onions, you name it!
  • Crowd Pleaser: Perfect for feeding the whole family or a brunch party without breaking a sweat.

Ingredients for Your High Protein Egg Bake Casserole

Okay, let’s talk about what goes into this amazing casserole! The beauty of this recipe is that it uses pretty standard stuff you probably already have, but the *combination* makes it special. Trust me, getting these ingredients just right is key to that fluffy, savory goodness. We’re going for flavor, protein, and a little bit of veggie goodness in every bite. And hey, if you’re ever looking for more sausage and veggie combos, check out this Sheet Pan Gnocchi with Sausage and Vegetables – it’s pretty darn tasty too!

Here’s what you’ll need:

  • 12 large eggs: These are the stars, obviously! They make the casserole fluffy and bind everything together.
  • 1 cup whole milk: Whole milk gives it a richer, creamier texture than skim.
  • 1 cup small curd cottage cheese: Don’t skip this! It adds an incredible creaminess and *loads* of extra protein without a strong flavor.
  • 1 teaspoon kosher salt: Essential for bringing out all the flavors.
  • 1/2 teaspoon black pepper: For that perfect little kick.
  • 1 cup shredded sharp cheddar cheese: Because cheese makes everything better, right? Sharp cheddar gives it a nice punch.
  • 1 pound beef breakfast sausage: Make sure it’s the breakfast kind, nice and crumbly!
  • 1 teaspoon olive oil: Just a little to help us sauté the veggies.
  • 1 cup diced red bell pepper: Adds a little sweetness and a nice pop of color.
  • 1 cup chopped fresh baby spinach: It wilts right down, adding nutrients and a subtle earthy flavor.
  • 1/2 cup finely diced yellow onion: For that savory depth of flavor.

Step-by-Step Instructions for Making High Protein Egg Bake Casserole

Alright, let’s get down to business! Making this casserole is honestly super straightforward. I find that the key is just taking it one step at a time, and before you know it, you’ve got a fantastic, protein-packed breakfast ready to go. It’s funny, sometimes I feel like I’m practically on autopilot making this, but I always remember Grandma telling me to pay attention to the little things – they make all the difference! If you’re looking for other easy oven recipes, you might enjoy these crispy baked fries or my famous honey butter fried chicken.

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Preheating and Preparing the Dish

First things first, let’s get that oven nice and toasty! Preheat it to 375 degrees Fahrenheit. While it’s warming up, grab your 9 by 13 inch baking dish and give it a good grease. A little bit of olive oil or some cooking spray works perfectly. This just makes sure nothing sticks later, which is always a win!

Cooking the Sausage and Sautéing Vegetables

Now, grab a large skillet and heat up that teaspoon of olive oil over medium heat. Toss in your pound of beef breakfast sausage. Let it cook for about 6 to 8 minutes, breaking it up with your spoon as it goes. You want it nice and browned all over. Remember to cook that sausage until it reaches an internal temperature of 160 degrees F – food safety first, always! Once it’s cooked, scoop it out onto a plate and set it aside. Don’t wipe out that skillet just yet; we’re going to use those yummy bits! Add your diced red bell pepper and onion to the same skillet. Cook ’em for about 3 to 4 minutes until they start to soften up a bit. Then, toss in your spinach and stir it for just a minute until it wilts down. Take the skillet off the heat.

Creating the Egg Mixture

Grab a big bowl – make sure it’s big enough! Crack in all 12 large eggs. Pour in the whole milk and then add that cup of small curd cottage cheese. Sprinkle in your kosher salt and black pepper. Now, get your whisk and go to town! Whisk it all together until it’s nicely combined and looks a little frothy. This is where you really get everything blended perfectly.

Combining Ingredients and Baking

Okay, super easy from here! Stir in that shredded sharp cheddar cheese, the cooked sausage you set aside, and all those lovely sautéed vegetables into the big bowl with the egg mixture. Give it a good stir so everything is distributed evenly. Once it’s all mixed up, pour this glorious mixture into the baking dish you prepped earlier. Spread it out evenly so it bakes up nice and flat. Pop it into your preheated oven and bake for about 30 to 35 minutes. You’ll know it’s ready when the center is set and a knife you poke in comes out clean. The top should be a pretty golden brown too!

A slice of High Protein Egg Bake Casserole with sausage, spinach, red peppers, and melted cheese.

Resting and Serving

This is a tough step, I know, but trust me on this one! Let the casserole rest for about 5 to 10 minutes after you take it out of the oven. This little bit of downtime helps it firm up, making it much easier to slice without it falling apart. Once it’s had its little break, slice it up and serve it warm. Enjoy that deliciousness!

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A slice of High Protein Egg Bake Casserole with sausage, spinach, red peppers, and melted cheese.

Tips for the Perfect High Protein Egg Bake Casserole

You know, like any good recipe, there are a few little tricks I’ve picked up over time that really make this High Protein Egg Bake Casserole sing. It’s already pretty forgiving, but a few small tweaks can make a huge difference! For instance, if you love sausage and veggie combos as much as I do, you should totally check out my Sausage and Vegetable Skillet – it’s another winner!

First off, let’s talk fluffiness. That cottage cheese is your secret weapon here, but make sure it’s the small curd kind! It blends in better and adds creaminess without chunky bits. If you want it *extra* fluffy, you can whisk those eggs and milk a little longer – get some good air in there. Also, don’t overbake it! Seriously, pull it out when the center is just set. A knife should come out with moist crumbs, not wet batter. Overbaking is the fastest way to a dry, sad casserole.

Want to switch things up? Go for it! You can absolutely swap out the veggies. Broccoli florets, mushrooms, cherry tomatoes, or even some chopped kale would be delicious. For cheese, a Monterey Jack or a sharp white cheddar are yummy alternatives. If you’re not a beef sausage fan, ground turkey or even chicken sausage can work, just make sure they’re fully cooked. And if you’re watching your sodium, you can always cut back a smidge on the added salt.

Make-Ahead and Storage Instructions

Okay, this is seriously where this casserole shines! If you’re like me and want to grab breakfast without a fuss during the week, this is your BFF. You can totally make the whole thing the night before. Just let it cool down completely after baking, then cover it really well with plastic wrap or pop it into an airtight container. Pop it in the fridge, and it’ll be good for about 3 to 4 days. Seriously, it’s a lifesaver for those early mornings!

When you’re ready to reheat, just slice yourself a piece and zap it in the microwave for about 30-60 seconds, or until it’s nice and warm. If you’re heating a bigger chunk, it might take a little longer. You can also pop a slice into a toaster oven for a slightly crisped edge, which is pretty amazing too. For even more make-ahead inspiration, check out my Breakfast Egg Muffins – they’re another awesome way to get ahead!

Frequently Asked Questions about High Protein Egg Bake Casserole

Got questions? I’ve got answers! This casserole is pretty straightforward, but sometimes little things pop up. If you’re curious about making it your own or just want to know a bit more, check out these FAQs. And for more speedy high-protein ideas, take a peek at my guide to high-protein breakfasts in 15 minutes!

Can I use different types of sausage?

Absolutely! While beef breakfast sausage is fantastic here, feel free to use ground turkey sausage, chicken sausage, or even a spicy Italian sausage if you like a little heat. Just make sure it’s cooked thoroughly before adding it to the egg mixture.

Can I make this vegetarian?

You sure can! Simply omit the sausage altogether. You might want to add a little extra cheese or perhaps some sautéed mushrooms for added flavor and texture. It’ll still be delicious and packed with protein from the eggs and cottage cheese!

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How do I prevent the vegetables from making the casserole watery?

Great question! The key is to sauté your vegetables (especially onions and peppers) until they’re slightly softened and any excess moisture has evaporated. For spinach, make sure to cook it until it’s fully wilted and squeeze out any extra liquid before adding it to the egg mixture. This small step prevents a watery casserole!

Can I freeze this casserole?

Yes, you can! After baking and cooling completely, cut the casserole into individual servings, wrap each piece well in plastic wrap, then place them in a freezer-safe bag or container. It should keep in the freezer for about 1 to 2 months. Thaw overnight in the fridge and reheat as usual.

Nutritional Information (Estimated)

Just a heads-up, the nutritional info here is an estimate, and it can totally change depending on the exact ingredients you use. But generally, when you whip up this High Protein Egg Bake Casserole, you’re looking at around 300 calories per serving. It’s also got about 21g of fat, 5g of carbs, and a whopping 24g of protein, which is pretty fantastic for breakfast!

A delicious slice of High Protein Egg Bake Casserole with sausage, peppers, spinach, and melted cheese.

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A delicious slice of High Protein Egg Bake Casserole with sausage, red peppers, spinach, and cheese.

High Protein Egg Bake Casserole


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  • Author: chefsofia
  • Total Time: 50 min
  • Yield: 8 servings
  • Diet: Vegetarian

Description

A high protein egg bake casserole with beef sausage, vegetables, and cheddar cheese. It is fluffy, meal prep friendly, and suitable for serving many people.


Ingredients

  • 12 large eggs
  • 1 cup whole milk
  • 1 cup small curd cottage cheese
  • 1 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1 cup shredded sharp cheddar cheese
  • 1 pound beef breakfast sausage
  • 1 teaspoon olive oil
  • 1 cup diced red bell pepper
  • 1 cup chopped fresh baby spinach
  • 1/2 cup finely diced yellow onion


Instructions

  1. Preheat your oven to 375 degrees F. Lightly grease a 9 by 13 inch baking dish with olive oil or cooking spray.
  2. Heat olive oil in a large skillet over medium heat. Add beef sausage and cook for 6 to 8 minutes, breaking it into crumbles, until fully browned and cooked to an internal temperature of 160 degrees F. Transfer to a plate and set aside.
  3. In the same skillet, add diced bell pepper and onion. Cook for 3 to 4 minutes until softened. Stir in spinach and cook for 1 minute until wilted. Remove from heat.
  4. In a large bowl, whisk together eggs, milk, cottage cheese, salt, and black pepper until well combined and slightly frothy.
  5. Stir in shredded cheddar cheese, cooked sausage, and sautéed vegetables until evenly distributed.
  6. Pour the mixture into the prepared baking dish and spread evenly.
  7. Bake for 30 to 35 minutes until the center is set and a knife inserted in the middle comes out clean. The top should be lightly golden.
  8. Let the casserole rest for 5 to 10 minutes before slicing to help it firm up. Serve warm.

Notes

  • Cook ground beef sausage to an internal temperature of 160 degrees F as measured with a meat thermometer to ensure it is safe to eat.
  • Prep Time: 15 min
  • Cook Time: 35 min
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American

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