High Protein Sausage Egg Casserole – A Comforting, Make-Ahead Breakfast

If your mornings feel rushed but you still want a real breakfast, this casserole has your back. It’s hearty, packed with protein, and tastes like a weekend treat you can enjoy any day of the week. You can assemble it the night before or whip it up in the morning with minimal fuss.

It feeds a crowd, reheats beautifully, and keeps you full for hours. Best of all, it’s easy to tweak based on what you have in the fridge.

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High Protein Sausage Egg Casserole - A Comforting, Make-Ahead Breakfast

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Prep Time 15 minutes mins

Cook Time 40 minutes mins

Total Time 55 minutes mins

Servings: 8 servings

Ingredients Method

Ingredients

  

• 1 pound (450 g) lean breakfast sausage (pork or turkey), casings removed
• 1 small yellow onion, diced
• 1 red bell pepper, diced
• 2 cups (about 60 g) baby spinach, roughly chopped
• 10 large eggs
• 1 cup (240 ml) egg whites (carton is fine)
• 1 cup (225 g) low-fat cottage cheese
• 1 cup (115 g) shredded cheddar or Monterey Jack, divided
• 1/2 cup (120 ml) milk (dairy or unsweetened almond milk)
• 1 teaspoon Dijon mustard (optional, for depth)
• 1 teaspoon garlic powder
• 1/2 teaspoon smoked paprika
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• Olive oil or cooking spray for the dish

Method

 

1. Preheat and prep: Heat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with cooking spray or a little olive oil.
2. Cook the sausage: Set a large skillet over medium heat. Add the sausage, breaking it up with a spatula. Cook until browned and cooked through, about 6–8 minutes. Drain excess fat if needed.
3. Soften the veggies: Add the diced onion and red pepper to the sausage. Cook 3–4 minutes until softened. Stir in the spinach and cook just until wilted, about 1 minute. Remove from heat and let it cool slightly.
4. Blend the egg base: In a large bowl, whisk the eggs, egg whites, cottage cheese, milk, Dijon, garlic powder, smoked paprika, salt, and pepper. For an extra smooth texture, you can blend the cottage cheese with the milk first, then whisk in the eggs.
5. Assemble: Spread the sausage and veggie mixture evenly in the baking dish. Sprinkle half of the shredded cheese on top. Pour the egg mixture over everything. Finish with the remaining cheese.
6. Bake: Place the dish on the middle rack and bake 35–45 minutes, until the center is set and the top is lightly golden. A knife inserted near the center should come out mostly clean.
7. Rest and serve: Let the casserole rest 10 minutes before slicing. This helps it set and makes clean squares. Serve warm with hot sauce, salsa, or a spoonful of Greek yogurt if you like.

What Makes This Special

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This isn’t just another breakfast bake—it’s a practical, satisfying meal that works for busy schedules and different diets. The combination of eggs, sausage, and cottage cheese delivers serious protein without feeling heavy.

There’s no complicated prep, and most of the work happens in one skillet and one baking dish. It’s ideal for meal prep, weekend brunch, or a power-up lunch with a simple side salad. Think: comfort food that also aligns with your goals.

Ingredients

• 1 pound (450 g) lean breakfast sausage (pork or turkey), casings removed
• 1 small yellow onion, diced
• 1 red bell pepper, diced
• 2 cups (about 60 g) baby spinach, roughly chopped
• 10 large eggs
• 1 cup (240 ml) egg whites (carton is fine)
• 1 cup (225 g) low-fat cottage cheese
• 1 cup (115 g) shredded cheddar or Monterey Jack, divided
• 1/2 cup (120 ml) milk (dairy or unsweetened almond milk)
• 1 teaspoon Dijon mustard (optional, for depth)
• 1 teaspoon garlic powder
• 1/2 teaspoon smoked paprika
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• Olive oil or cooking spray for the dish

Instructions

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1. Preheat and prep: Heat your oven to 350°F (175°C).

   Lightly grease a 9×13-inch baking dish with cooking spray or a little olive oil.

2. Cook the sausage: Set a large skillet over medium heat. Add the sausage, breaking it up with a spatula. Cook until browned and cooked through, about 6–8 minutes.

   Drain excess fat if needed.

3. Soften the veggies: Add the diced onion and red pepper to the sausage. Cook 3–4 minutes until softened. Stir in the spinach and cook just until wilted, about 1 minute.

   Remove from heat and let it cool slightly.

4. Blend the egg base: In a large bowl, whisk the eggs, egg whites, cottage cheese, milk, Dijon, garlic powder, smoked paprika, salt, and pepper. For an extra smooth texture, you can blend the cottage cheese with the milk first, then whisk in the eggs.
5. Assemble: Spread the sausage and veggie mixture evenly in the baking dish. Sprinkle half of the shredded cheese on top.

   Pour the egg mixture over everything. Finish with the remaining cheese.

6. Bake: Place the dish on the middle rack and bake 35–45 minutes, until the center is set and the top is lightly golden. A knife inserted near the center should come out mostly clean.
7. Rest and serve: Let the casserole rest 10 minutes before slicing.

   This helps it set and makes clean squares. Serve warm with hot sauce, salsa, or a spoonful of Greek yogurt if you like.

How to Store

• Refrigerator: Cool completely, then store slices in airtight containers for up to 4 days.
• Freezer: Wrap individual portions tightly and freeze for up to 2 months. Thaw overnight in the fridge.
• Reheat: Microwave a slice for 60–90 seconds, or reheat covered in a 300°F (150°C) oven for 10–12 minutes.

  Add a splash of water and cover loosely if it looks dry.

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Health Benefits

This casserole is built around high-quality protein from eggs, sausage, and cottage cheese. Protein supports muscle repair, steady energy, and better satiety, which can help reduce snacking later. The vegetables add fiber, vitamins A and C, and minerals that round out the meal.

Using lean sausage and a mix of whole eggs with egg whites keeps calories in check without shortchanging flavor. If you’re watching carbs, it’s naturally lower-carb compared to bread-based bakes.

What Not to Do

• Don’t skip draining excess fat. Too much grease can make the casserole feel heavy and greasy.
• Don’t overbake. Dry, rubbery eggs happen fast. Pull it as soon as the center is just set.
• Don’t overload with watery veggies. Mushrooms or zucchini are great, but sauté them first to cook off moisture.
• Don’t under-season. Eggs need salt.

  Taste the sausage and adjust the egg mixture before baking.

• Don’t slice immediately. A short rest helps clean cuts and better texture.

Variations You Can Try

• Turkey or chicken sausage: Leaner, still flavorful. Add a pinch of fennel seed for that classic breakfast sausage vibe.
• Veggie-forward: Swap sausage for sautéed mushrooms and an extra cup of spinach. Add feta and sun-dried tomatoes.
• Southwest style: Use pepper jack, add diced green chiles and a teaspoon of chili powder, and top with avocado and salsa.
• Mediterranean: Stir in olives, roasted red peppers, oregano, and crumbled feta.
• Hash brown base: Press thawed, squeezed-dry hash browns into the dish with a little oil and bake 10 minutes before adding the filling.
• Cottage cheese swap: Use ricotta or plain Greek yogurt for a similar protein boost and creamy texture.
• Dairy-free: Use unsweetened almond milk, skip the cottage cheese, and choose a dairy-free shredded cheese you like.

  Add an extra 2 egg whites for structure.

FAQ

Can I make this the night before?

Yes. Assemble everything, cover tightly, and refrigerate overnight. In the morning, uncover and bake straight from the fridge, adding 5–10 minutes to the bake time if needed.

How do I know when it’s done?

The edges will be puffed and golden, and the center should be set but not dry.

A knife inserted near the center should come out mostly clean, and the internal temperature will be around 165°F (74°C).

Can I use only whole eggs and skip the egg whites?

Absolutely. Use 12 whole eggs instead of the 10 eggs plus egg whites. The casserole will be richer and slightly higher in calories.

What cheese works best?

Cheddar melts well and adds familiar flavor.

Monterey Jack, pepper jack, mozzarella, or a blend also work. For a sharper bite, try aged cheddar or a little Parmesan mixed in.

Is there a way to cut sodium?

Choose lower-sodium sausage, reduce added salt, and use a lighter hand with cheese. Fresh herbs like chives or parsley add pop without more salt.

Can I bake this in muffin tins?

Yes.

Grease a 12-cup muffin tin and bake 18–22 minutes, or until set. Great for grab-and-go breakfasts and portion control.

What if I don’t have cottage cheese?

Use ricotta or plain Greek yogurt in equal amounts. Both give creaminess and protein, though yogurt adds tang and may set a bit firmer.

Why is my casserole watery?

Likely excess moisture from veggies or not letting it rest.

Sauté watery vegetables until most liquid cooks off, and give the baked casserole 10 minutes to settle before slicing.

Can I add potatoes or bread?

Yes. Stir in 2 cups of cooked, diced potatoes or 2 cups of cubed, lightly toasted bread. You may need a few extra minutes of bake time.

How many servings does this make?

A 9×13-inch pan yields about 8 generous servings.

For smaller portions, cut into 10 or 12 pieces and pair with fruit or greens.

In Conclusion

This High Protein Sausage Egg Casserole is the rare kind of breakfast that’s both comforting and goal-friendly. It’s simple to make, easy to customize, and sturdy enough for meal prep. Whether you’re feeding a crowd or planning ahead for the week, it delivers on flavor, texture, and staying power.

Keep the base recipe handy, then riff with your favorite add-ins to make it your own.

About the Author

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Brandon D

Blogger/Fitness & Wellness Coach

I create quick, healthy, family-friendly recipes that make dinner simple, delicious, and stress-free.