10x15 Breakfast Casserole Recipe for Easy Mornings

Looking for a hearty, make-ahead breakfast that feeds a crowd? This 10×15 breakfast casserole is perfect for weekend brunches, holiday mornings, or meal prepping. Its simple ingredients and straightforward steps make it a reliable and delicious choice that everyone will love.

Ingredients

1 pound (16 oz) breakfast sausage (mild or spicy, according to preference)
8 large eggs
2 cups whole milk (or 2% for lighter option)
1 teaspoon salt
1/2 teaspoon black pepper
4 cups shredded cheese (cheddar, Monterey Jack, or a blend)

1 medium onion, finely chopped
1 red bell pepper, diced (optional)
6 slices of bread, cubed (white, whole wheat, or sourdough)
2 tablespoons butter, melted
Optional toppings: chopped chives, hot sauce, salsa

Instructions

Preheat your oven to 350°F (175°C). Grease a 10×15-inch baking dish with butter or non-stick spray and set aside.
Cook the sausage in a large skillet over medium heat until browned and crumbled, about 5-7 minutes. Drain excess fat. Add the chopped onion and diced bell pepper, cooking until softened, about 3-4 minutes. Remove from heat.

In a large mixing bowl, whisk together the eggs, milk, salt, and pepper until well combined.
Spread the cubed bread evenly across the prepared baking dish. Distribute the cooked sausage mixture over the bread.
Sprinkle the shredded cheese evenly over the sausage and bread layers.

Pour the egg mixture over everything, ensuring all ingredients are soaked. Drizzle the melted butter evenly on top.
Cover the dish with plastic wrap or foil and refrigerate for at least 1 hour, or overnight for best results.
When ready to bake, remove from the fridge and let sit at room temperature for about 15 minutes. Bake uncovered in the preheated oven for 40-45 minutes, until the top is golden and the casserole is set.

Remove from oven and let rest for 5 minutes before slicing. Serve hot, garnished with optional toppings like chopped chives or salsa.

Tips

Use day-old bread or slightly stale bread for better absorption of the egg mixture. Fresh bread can become too soggy.
Feel free to substitute the sausage with cooked bacon, ham, or even sautéed vegetables for a vegetarian option.

For a creamier casserole, add a splash of heavy cream or sour cream to the egg mixture.
If preparing ahead, assemble the casserole the night before and store it covered in the fridge. Bake in the morning for a fresh, hot meal.

Serving Suggestions

This breakfast casserole pairs beautifully with fresh fruit salad, a side of crispy breakfast potatoes, or a light green salad. For beverages, serve with orange juice, coffee, or tea to round out the meal.

Variations

Vegetarian: Skip the sausage and add sautéed mushrooms, spinach, or zucchini for added flavor and nutrition.
Low-carb: Use a cauliflower bread or omit the bread altogether, increasing the egg and cheese ratio.
Spicy: Incorporate jalapeños or hot sauce into the egg mixture for a kick.

Meat lover’s: Add cooked bacon or shredded cooked chicken for extra protein.

Storage and Reheating

Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, microwave individual portions on high for 1-2 minutes, or reheat the whole casserole in the oven at 350°F (175°C) for about 20 minutes until warmed through. For best texture, reheat covered with foil to prevent drying out.

Frequently Asked Questions

Can I prepare this casserole the night before?

Yes, you can assemble the casserole, cover it tightly, and refrigerate overnight. Baking the next morning ensures flavors meld and saves time on busy mornings.

What if I don’t have 10×15-inch dish?

Use a similar-sized dish or a slightly larger or smaller one, adjusting baking time accordingly. Keep an eye on the casserole; it’s done when the top is golden and the center is set.

Can I freeze leftovers?

Absolutely. Let the casserole cool completely, then cut into portions. Wrap tightly in plastic wrap and foil, and freeze for up to 2 months. Thaw overnight in the fridge before reheating.

Is there a gluten-free version?

Yes. Substitute the bread with gluten-free bread or omit it altogether, perhaps adding extra eggs or cheese to maintain texture. Be mindful of other ingredients like sausage—choose gluten-free options if necessary.

How can I make this dish more kid-friendly?

Use milder sausage, add favorite veggies like diced tomatoes or corn, and serve with a side of fruit. You can also customize toppings to suit children’s tastes.

What are some common mistakes to avoid?

Over-soaking the bread can make the casserole too soggy, so ensure the egg mixture is evenly distributed but not excessive. Also, avoid under-baking; ensure the casserole is fully cooked and set before removing from the oven.

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10×15 Breakfast Casserole Recipe for Easy Mornings