High-Protein Breakfast Casserole

Why You’ll Love High-Protein Breakfast Casserole Recipe

I love this recipe because it is easy to prepare, incredibly nourishing, and perfect for meal prep. It keeps me full for hours thanks to the protein-packed eggs, sausage, and cottage cheese. I also enjoy how flexible it is, making it simple to adjust flavors or vegetables based on what I have in my kitchen.

Ingredients

(Note: All ingredient amounts are listed in the recipe card below.)

10 large eggs

1 ½ cups low-fat cottage cheese

1 lb lean turkey sausage

2 cups fresh spinach

1 cup shredded cheddar or mozzarella cheese

½ tsp garlic powder

½ tsp salt

¼ tsp black pepper

Olive oil spray

Directions

I start by preheating my oven to 375°F (190°C) and lightly coating a 9×13-inch baking dish with olive oil spray. I cook the turkey sausage in a skillet over medium-high heat, breaking it up until fully browned, then set it aside to cool slightly. In a large bowl, I whisk the eggs until smooth, then stir in the cottage cheese, shredded cheese, garlic powder, salt, and black pepper. I fold in the cooked sausage and fresh spinach, mixing gently until everything is evenly combined. I pour the mixture into the prepared baking dish, spread it into an even layer, and bake for 35–40 minutes until the center is set and the edges are golden. I let it rest for a few minutes before slicing and serving.

Servings and Timing

This casserole makes about 8 generous servings. I spend roughly 10 minutes on prep and about 35–40 minutes baking, bringing the total time to around 45–50 minutes.

Variations

When I want more vegetables, I add bell peppers, onions, or mushrooms. I sometimes swap the cheddar for pepper jack when I want extra flavor. For a lighter version, I replace some of the whole eggs with egg whites. If I am feeding vegetarians, I skip the sausage and add more vegetables instead.

Storage/Reheating

I store leftovers in an airtight container in the refrigerator for up to four days. When reheating, I warm individual portions in the microwave until heated through. For longer storage, I freeze slices wrapped tightly and reheat them straight from frozen when needed.

FAQs

Can I make this casserole ahead of time?

I often prepare it the night before and bake it in the morning, which saves me time on busy days.

Can I freeze this breakfast casserole?

I freeze individual portions regularly, and they reheat very well.

Is cottage cheese noticeable in the final dish?

I do not taste it at all, and it blends into the eggs, making the casserole creamy.

What pan size works best?

I always use a 9×13-inch baking dish for even cooking.

Can I use a different type of sausage?

I sometimes use chicken , depending on what I have available.

How do I know when it is fully cooked?

I check that the center is set and a knife inserted comes out clean.

Can I add more cheese?

I occasionally sprinkle extra cheese on top before baking for a richer finish.

Is this casserole low-carb?

I consider it low-carb since it is mainly eggs, cheese, and protein.

Can I serve this for brunch?

I love serving it for brunch with fresh fruit or a light salad.

How long should it cool before slicing?

I usually wait about 5–10 minutes so the slices hold their shape.

Conclusion

I keep this high-protein breakfast casserole in my regular rotation because it delivers comfort, nutrition, and convenience all in one dish. It helps me start my mornings feeling full, energized, and ready to take on whatever the day brings.