If your mornings feel rushed, this casserole will save your day. It’s simple to prep, bakes in one pan, and packs a serious protein punch to keep you full for hours. You can assemble it the night before or mix it up in the morning and let the oven do the work.
It reheats well, tastes great, and uses everyday ingredients you probably already have. Whether you’re feeding a family or meal prepping for yourself, this recipe is a reliable go-to.
What Makes This Recipe So Good
- High in protein: Eggs, cottage cheese, and turkey sausage combine for steady energy and fewer mid-morning crashes.
- Easy to prep: Everything mixes in one bowl and bakes in one pan. Minimal dishes, maximum payoff.
- Customizable: Swap veggies, cheeses, or meats based on what you like or what’s in your fridge.
- Make-ahead friendly: Prep it the night before, bake in the morning, and you’re set for the week.
- Great for a crowd: Slices neatly and holds well on a brunch table or in lunchboxes.
What You’ll Need
- 12 large eggs
- 1 cup cottage cheese (2% or 4% for best texture)
- 1 cup shredded cheese (cheddar, mozzarella, or pepper jack)
- 1 pound lean turkey sausage (or chicken sausage), casings removed
- 1 cup diced bell peppers (any color)
- 1 cup baby spinach, chopped
- 1/2 cup diced red onion
- 1/2 cup milk (dairy or unsweetened almond milk)
- 2 cloves garlic, minced
- 1 teaspoon kosher salt (adjust to taste)
- 1/2 teaspoon black pepper
- 1/2 teaspoon smoked paprika (optional, for depth)
- 1/4 teaspoon crushed red pepper (optional, for heat)
- Olive oil or cooking spray for the pan
Instructions
- Preheat the oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish with olive oil or cooking spray.
- Cook the sausage: Warm a large skillet over medium heat. Add turkey sausage and break it up with a spatula. Cook until browned and no longer pink, about 6–8 minutes.
Transfer to a paper towel–lined plate.
- Sauté veggies: In the same skillet, add a drizzle of oil if needed. Cook onions and bell peppers for 3–4 minutes until slightly softened. Stir in garlic for 30 seconds.
Fold in spinach just until wilted. Remove from heat.
- Blend the base: In a large bowl, whisk eggs, milk, salt, pepper, smoked paprika, and crushed red pepper. Whisk in cottage cheese until mostly smooth.
A few small curds are fine.
- Assemble the casserole: Spread the cooked sausage and sautéed veggies evenly in the baking dish. Sprinkle half the shredded cheese on top. Pour the egg mixture evenly over everything.
Top with the remaining cheese.
- Bake for 30–35 minutes, or until the center is set and a knife inserted in the middle comes out clean. The top should be lightly golden.
- Rest and slice: Let the casserole sit for 8–10 minutes to firm up. Slice into 8–10 squares and serve warm.
How to Store
- Refrigerator: Cool completely, then store slices in airtight containers for up to 4 days.
- Freezer: Wrap individual portions tightly in plastic wrap, then place in a freezer bag.
Freeze up to 2 months. Thaw overnight in the fridge.
- Reheat: Microwave slices for 60–90 seconds, or warm in a 325°F oven for 10–12 minutes until heated through.
Benefits of This Recipe
- High protein, balanced macros: Eggs, sausage, and cottage cheese provide protein; veggies add fiber and micronutrients.
- Sustained energy: Keeps you full longer, which can help manage cravings and reduce snacking.
- Budget-friendly: Uses staple ingredients and stretches into multiple meals.
- Meal prep hero: One bake gives you breakfast for days, making busy mornings easier.
- Gluten-free option: Naturally gluten-free when you choose a gluten-free sausage.
Pitfalls to Watch Out For
- Watery casserole: Overloading with watery veggies (like tomatoes or mushrooms) without pre-cooking can make it soggy. Sauté moisture-heavy veggies first.
- Rubbery texture: Overbaking dries out the eggs.
Pull it when the center is just set and still slightly jiggly.
- Under-seasoning: Eggs need salt. Taste your sausage and adjust spices accordingly before baking.
- Uneven baking: A crowded oven or cold ingredients can add time. Let ingredients come to room temp for 10 minutes if you can.
Variations You Can Try
- Veggie-loaded: Swap sausage for 1 cup cooked mushrooms and 1 extra cup spinach.
Add a pinch of thyme.
- Southwest: Use pepper jack cheese, add 1/2 cup black beans (drained) and 1/2 cup corn. Top with salsa and avocado.
- Greek-style: Use feta instead of cheddar, add chopped sun-dried tomatoes, olives, and oregano.
- Bacon and broccoli: Replace sausage with cooked, crumbled turkey bacon and 1 cup steamed, chopped broccoli.
- Low-dairy: Skip cottage cheese and use an extra 4 eggs plus 1/4 cup unsweetened almond milk. Use a lactose-free cheese or omit.
- Hash brown base: Press 3 cups thawed, squeezed-dry hash browns into the dish, lightly oiled.
Par-bake 10 minutes, then assemble and bake.
FAQ
Can I make this the night before?
Yes. Assemble everything in the baking dish, cover tightly, and refrigerate overnight. In the morning, uncover and bake.
Add 5–10 extra minutes if the mixture is very cold.
What can I use instead of cottage cheese?
You can use ricotta or Greek yogurt. Ricotta keeps it rich and tender, while Greek yogurt adds tang. If using yogurt, reduce the milk to 1/4 cup to avoid a too-thin batter.
How do I know when it’s done?
The edges should be set and lightly golden, and the center should no longer look wet.
A knife inserted in the middle should come out clean or with a few moist crumbs, not liquid egg.
Can I use whole eggs and egg whites?
Absolutely. Use 8 whole eggs plus 1 cup liquid egg whites for a leaner option. The texture stays fluffy, and protein stays high.
What’s the best pan size?
A 9×13-inch dish works best for even baking.
An 8×8 will be thicker and need an extra 10–15 minutes. Metal pans bake faster than glass.
How can I add more veggies without making it watery?
Sauté moisture-heavy veggies first and drain any excess liquid. Pat them dry if needed before adding to the dish.
Is turkey sausage necessary?
No.
You can swap in chicken sausage, lean ground turkey, or even crumbled tofu that’s been sautéed with your favorite spices.
Can I make it spicy?
Yes. Add diced jalapeño with the peppers, use pepper jack cheese, and increase crushed red pepper to 1/2 teaspoon.
How much protein is in a serving?
Exact numbers vary by brands, but a typical serving (1/8 of the casserole) lands around 22–28 grams of protein when made with turkey sausage, cottage cheese, and cheddar.
Why is my casserole pale on top?
If you want more color, switch to the broiler for 1–2 minutes at the end. Watch closely to prevent burning.
Wrapping Up
This high protein breakfast casserole is the kind of recipe you keep on repeat: simple steps, flexible ingredients, and dependable results.
It feeds a crowd, reheats beautifully, and actually keeps you full. Make it once on Sunday, and your weekday breakfasts are handled. Keep a few variations in your back pocket, and you’ll never get bored.
Here’s to better mornings with less fuss and more flavor.
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