Cheesy Veggie & Sausage Breakfast Casserole

Cheesy Veggie & Sausage Breakfast Casserole is a hearty, satisfying dish that’s perfect for feeding a family, serving at brunch, or preparing ahead for busy mornings. Packed with savory breakfast sausage, fluffy eggs, colorful vegetables, creamy cheese, and fresh herbs, this casserole delivers a delicious balance of protein, vegetables, and rich flavor in every bite. It bakes into a beautifully golden casserole with a soft, fluffy center and lightly browned cheesy top that’s impossible to resist.

One of the best things about this breakfast casserole is its versatility. You can prepare it the night before and simply bake it the next morning, making it ideal for holiday breakfasts, weekend gatherings, meal prep, or weekday breakfasts when time is limited. It reheats beautifully and tastes just as delicious the next day.

Fresh zucchini, sweet bell peppers, juicy cherry tomatoes, and onions add color, texture, and nutrition while breakfast sausage provides hearty flavor. Cottage cheese keeps the eggs extra creamy without making the casserole overly heavy, while shredded cheese melts into every layer for a rich, cheesy finish.

Serve this casserole alongside fresh fruit, toast, roasted potatoes, or a simple green salad for a complete breakfast or brunch that everyone will love.

Preparation Time: 20 minutes

Cooking Time: 45 minutes

Total Time: 1 hour 5 minutes

Servings: 8

Ingredients

Base & Proteins

10 large eggs

1 pound breakfast sausage (ground pork, chicken, or turkey)

Dairy

1½ cups shredded sharp cheddar cheese (or Monterey Jack or mozzarella)

¾ cup cottage cheese

Fresh Vegetables

1 medium zucchini, diced or sliced into half-moons

1 cup cherry tomatoes, halved

1 bell pepper, diced

½ cup onion, diced

2 tablespoons fresh parsley or basil, chopped

Seasonings & Oil

1 tablespoon olive oil

½ teaspoon salt

¼ teaspoon black pepper

½ teaspoon garlic powder

Instructions

Prepare the Oven and Baking Dish

Preheat the oven to 375°F (190°C).

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

Cook the Sausage

Heat olive oil in a large skillet over medium heat.

Add the breakfast sausage and cook for about 7 to 8 minutes, breaking it into small crumbles until fully browned.

Transfer the cooked sausage to a plate lined with paper towels if needed to remove excess grease.

Cook the Vegetables

Using the same skillet, add the diced onion and bell pepper.

Cook for about 4 minutes until softened.

Add the zucchini and cook another 3 to 4 minutes until just tender.

Remove from the heat and allow the vegetables to cool slightly.

Prepare the Egg Mixture

In a large mixing bowl, whisk together the eggs until smooth.

Add the cottage cheese, garlic powder, salt, black pepper, and half of the chopped parsley.

Whisk until fully combined.

Assemble the Casserole

Spread the cooked sausage evenly across the prepared baking dish.

Distribute the sautéed vegetables over the sausage.

Scatter the halved cherry tomatoes evenly across the top.

Sprinkle one cup of shredded cheese throughout the casserole.

Pour the egg mixture evenly over all the ingredients.

Finish with the remaining shredded cheese.

Bake

Place the casserole in the preheated oven.

Bake for 40 to 45 minutes until the eggs are fully set and the cheese becomes golden brown.

The center should no longer jiggle when gently shaken.

If the cheese begins browning too quickly, loosely cover with aluminum foil during the final 10 minutes.

Rest Before Serving

Allow the casserole to rest for about 10 minutes before slicing.

Sprinkle with the remaining fresh parsley or basil before serving.

Serve warm.

Tips

Brown the Sausage Well

Proper browning creates deeper flavor and prevents excess moisture from entering the casserole.

Don’t Overcook the Vegetables

Cook them only until slightly tender since they’ll continue cooking while baking.

Drain Excess Liquid

If your zucchini releases moisture, blot it with paper towels before adding it to the casserole.

Room Temperature Eggs

Allow eggs to sit at room temperature for 15 to 20 minutes before whisking for a fluffier texture.

Whisk Thoroughly

Fully whisking the eggs incorporates air, producing a lighter casserole.

Use Freshly Shredded Cheese

Freshly grated cheese melts smoother than pre-shredded varieties.

Avoid Overbaking

Remove the casserole once the center is just set to keep the eggs soft and creamy.

Rest Before Cutting

Allowing the casserole to rest helps it slice neatly and keeps the layers intact.

Meal Prep Friendly

Bake the casserole completely, cool, then refrigerate individual portions for quick breakfasts throughout the week.

Freezer Friendly

Wrap slices individually and freeze for up to 3 months.

Reheat in the microwave or oven until warmed through.

Variations

Mediterranean Version

Replace the cheddar with feta cheese and add spinach, olives, oregano, and sun-dried tomatoes.

Mexican Style

Add jalapeños, black beans, corn, pepper jack cheese, taco seasoning, and serve with salsa.

Low-Carb Version

Increase the vegetables and reduce the tomatoes while skipping any starchy additions.

Loaded Breakfast Casserole

Add diced hash browns or cooked breakfast potatoes before pouring in the egg mixture.

Spinach and Mushroom

Replace zucchini with sautéed mushrooms and fresh spinach.

Turkey Sausage

Use turkey breakfast sausage for a lighter version that’s still packed with protein.

Italian Style

Use Italian sausage, mozzarella, Parmesan, basil, oregano, and roasted red peppers.

Extra Cheesy

Mix cream cheese into the egg mixture and top with mozzarella and cheddar.

Spicy Version

Add diced jalapeños, crushed red pepper flakes, cayenne, or hot breakfast sausage.

Vegetarian Option

Skip the sausage and add mushrooms, spinach, broccoli, roasted peppers, and extra cheese.

Q&A

Can I prepare this casserole the night before?

Yes. Assemble everything, cover tightly, refrigerate overnight, and bake the following morning.

Can I use milk instead of cottage cheese?

Yes. Half-and-half, whole milk, or heavy cream all work well and create a creamy texture.

Why is my casserole watery?

Vegetables like zucchini and tomatoes release moisture. Cook them first and remove excess liquid before assembling.

Can I freeze it?

Yes. Cool completely before freezing. Store in airtight containers for up to 3 months.

How do I know when it’s fully cooked?

The center should be firm and no longer jiggle. A knife inserted into the middle should come out clean.

Can I use different cheeses?

Absolutely. Cheddar, Monterey Jack, mozzarella, Swiss, Gouda, Colby Jack, Gruyère, or Pepper Jack all work wonderfully.

How long will leftovers last?

Stored in an airtight container, leftovers remain fresh for up to 4 days in the refrigerator.

Can I add more vegetables?

Yes. Mushrooms, broccoli, spinach, kale, asparagus, roasted peppers, or cauliflower all make excellent additions.

Can I make individual portions?

Yes. Divide the mixture among greased muffin tins and bake for about 20 to 25 minutes.

What should I serve with this casserole?

Fresh fruit, avocado slices, toast, breakfast potatoes, yogurt, muffins, pancakes, or a fresh green salad pair beautifully.

Nutrition

Per Serving (Approximate)

Calories: 395

Protein: 28g

Carbohydrates: 7g

Fat: 28g

Saturated Fat: 10g

Cholesterol: 290mg

Fiber: 1g

Sugar: 3g

Sodium: 640mg

Calcium: 260mg

Iron: 2mg

Conclusion

Cheesy Veggie & Sausage Breakfast Casserole is the perfect combination of comfort, convenience, and wholesome ingredients. Fluffy eggs, savory sausage, colorful vegetables, creamy cottage cheese, and melted cheese come together to create a filling breakfast that’s equally suitable for everyday mornings or special brunch gatherings. It’s easy to customize with your favorite vegetables, cheeses, and seasonings, making it a recipe you’ll return to again and again. Whether prepared fresh or made ahead for meal prep, this casserole offers delicious flavor, satisfying texture, and plenty of protein in every slice.