A warm, cheesy breakfast casserole is one of the easiest ways to feed a hungry family or impress weekend guests without spending all morning in the kitchen. This version combines fluffy eggs, savory sausage, crispy bread cubes, melty cheddar cheese, and colorful vegetables into one irresistible baked dish with a golden, bubbly top.
Perfect for holidays, brunch gatherings, meal prep, or lazy Sunday mornings.
Why You’ll Love This Breakfast Casserole
- Easy make-ahead breakfast
- Rich, cheesy, comforting flavor
- Perfect for feeding a crowd
- Customizable with bacon, ham, or veggies
- Great for meal prep and leftovers
Many popular breakfast casserole recipes rely on the same classic structure: eggs, cheese, bread, and savory meat baked until fluffy and golden.
Ingredients
For the Casserole
- 8 large eggs
- 2 cups whole milk
- 1 lb breakfast sausage
- 4 cups cubed bread (French bread or sourdough works best)
- 2 cups shredded sharp cheddar cheese
- 1 cup mozzarella cheese
- 1 small onion, diced
- 1 red bell pepper, diced
- 2 green onions, sliced
- 1 tsp garlic powder
- 1 tsp onion powder
- 1 tsp Italian seasoning
- 1/2 tsp paprika
- Salt and black pepper to taste
- 2 tbsp butter (for greasing dish)
Kitchen Tools You’ll Need
- 9×13 baking dish
- Large skillet
- Mixing bowls
- Whisk
- Measuring cups
How to Make Breakfast Casserole
Step 1: Prepare the Oven
Preheat your oven to 375°F (190°C).
Grease a 9×13-inch baking dish with butter.
Step 2: Cook the Sausage
In a large skillet over medium heat:
- Cook the breakfast sausage until browned
- Break it into crumbles
- Drain excess grease
Add diced onion and bell pepper and sauté for 3–4 minutes until softened.
Step 3: Make the Egg Mixture
In a large bowl whisk together:
- Eggs
- Milk
- Garlic powder
- Onion powder
- Italian seasoning
- Paprika
- Salt and pepper
Whisk until fully combined.
Step 4: Assemble the Casserole
Spread bread cubes evenly into the baking dish.
Top with:
- Cooked sausage mixture
- Cheddar cheese
- Mozzarella cheese
Pour egg mixture evenly over everything.
Lightly press the bread down so it absorbs the liquid.
Step 5: Bake
Bake uncovered for 40–45 minutes until:
- The center is set
- The top is golden brown
- Cheese is bubbling
Let rest for 5–10 minutes before serving.
Top with green onions.
Pro Tips for the Best Breakfast Casserole
Use Day-Old Bread
Slightly stale bread absorbs the egg mixture better and creates a richer texture.
Make It Overnight
Assemble everything the night before and refrigerate overnight. Bake fresh in the morning.
Add Extra Flavor
Try adding:
- Crispy bacon
- Diced ham
- Spinach
- Mushrooms
- Jalapeños
- Pepper jack cheese
What to Serve With Breakfast Casserole
This casserole pairs perfectly with:
- Fresh fruit
- Hash browns
- Pancakes
- Orange juice
- Coffee
- Avocado toast
Storage & Reheating
Refrigerator
Store covered for up to 4 days.
Freezer
Freeze slices individually for up to 2 months.
Reheating
Microwave individual slices for 1–2 minutes or reheat in the oven at 350°F.
Frequently Asked Questions
Can I Make It Without Bread?
Yes. Replace bread with hash browns or simply omit it for a low-carb version.
Can I Use Bacon Instead of Sausage?
Absolutely. Crispy bacon works wonderfully.
How Do I Know It’s Done?
The center should no longer jiggle when gently shaken.
Final Thoughts
This cheesy breakfast casserole delivers everything people love about a hearty breakfast in one easy dish: fluffy eggs, savory sausage, melty cheese, and rich comfort-food flavor. It’s simple enough for busy weekdays and impressive enough for holiday brunches.
For best results, serve warm with fresh fruit and hot coffee.
