13x9 Breakfast Casserole Recipe for Easy Mornings

Start your day with this hearty and versatile 13×9 breakfast casserole that can be prepared ahead of time and baked fresh in the morning. Perfect for busy weekends, brunch, or feeding a crowd, this dish combines eggs, cheese, bread, and savory ingredients into a satisfying meal everyone will love.

Ingredients

8 large eggs
2 cups milk (whole or 2%)
1 teaspoon salt
½ teaspoon black pepper
1 pound breakfast sausage or cooked bacon, crumbled or chopped
2 cups shredded cheese (cheddar, Monterey Jack, or a blend)

4 cups bread cubes (day-old bread or baguette slices)
1 cup chopped bell peppers (optional)
1 cup chopped onions (optional)
2 tablespoons chopped fresh parsley (optional for garnish)

Instructions

Preheat your oven to 350°F (175°C). Grease a 13×9-inch baking dish with butter or non-stick spray.
In a large mixing bowl, whisk together the eggs, milk, salt, and black pepper until well combined.
If using sausage or bacon, cook it thoroughly in a skillet until browned. Drain excess fat and crumble or chop into small pieces.

Add the cooked sausage or bacon, bread cubes, shredded cheese, bell peppers, and onions to the egg mixture. Stir gently to combine everything evenly.
Pour the mixture into the prepared baking dish, spreading it out evenly.
Cover the dish with plastic wrap or aluminum foil and refrigerate for at least 2 hours or overnight. This allows the bread to soak up the custard and enhances flavor.

When ready to bake, remove from the fridge and let sit at room temperature for 10-15 minutes. Then, bake uncovered for 45-50 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.
Let the casserole rest for 5 minutes before slicing. Garnish with chopped parsley if desired, then serve hot.

Tips

For a healthier twist, use egg whites or a combination of eggs and egg whites. Adjust cooking time accordingly.

Stale or day-old bread works best as it absorbs the custard better, preventing a soggy casserole.
To make ahead, assemble the casserole, cover, and refrigerate overnight. Bake in the morning for a quick breakfast.
Feel free to swap out ingredients like spinach, mushrooms, or cherry tomatoes for variety and added nutrition.

Serving Suggestions

Serve this breakfast casserole with a side of fresh fruit, a simple green salad, or crispy breakfast potatoes for a complete meal. It pairs well with hot sauce or salsa for an extra flavor kick.

Variations

Customize your casserole by adding cooked hash browns, sautéed vegetables, or different cheeses. For a vegetarian version, omit the meat and include extra vegetables or plant-based sausage substitutes. You can also make mini casseroles in muffin tins for individual servings, perfect for brunch or meal prep.

Storage and Reheating

Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, microwave individual portions for 1-2 minutes or reheat the entire casserole in an oven at 350°F (175°C) for 15-20 minutes until warmed through. For best results, reheat in small portions to prevent drying out.

Frequently Asked Questions

Can I prepare this casserole the night before?

Yes, assembling the casserole the night before and refrigerating it overnight allows the bread to soak up the custard, resulting in a more flavorful and cohesive dish. Just bake it in the morning as directed.

Can I freeze leftovers?

Absolutely. Let the casserole cool completely, then cut into portions, wrap tightly in plastic wrap or foil, and store in an airtight container or freezer bag. Freeze for up to 2 months. Reheat in the oven or microwave when ready to serve.

What variations can I try for a low-carb version?

Replace bread with cauliflower rice or omit it altogether. Use more vegetables and add extra cheese for richness. Adjust cooking time slightly to ensure the eggs are fully set without the bread.

Is it suitable for gluten-free diets?

Yes, if you use gluten-free bread or omit the bread entirely. Just ensure all other ingredients, especially processed ones like sausage or cheese, are gluten-free certified.

How do I prevent the casserole from becoming soggy?

Using slightly stale bread helps absorb excess moisture. Avoid over-soaking the bread in the custard, and don’t add too much liquid. Baking until the top is golden and crispy also ensures a better texture.

Can I add fresh herbs or spices?

Definitely! Fresh herbs like parsley, chives, or thyme add flavor. Spices such as paprika, cumin, or red pepper flakes can give your casserole a little extra kick. Add these to the egg mixture before baking for even distribution.

13×9 Breakfast Casserole Recipe for Easy Mornings