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Hearty Breakfast Casserole (Easy Make-Ahead Recipe)

Updated: Dec 24, 2025


Cheesy casserole with ground beef and peppers in a white dish. A serving is being lifted out, topped with melted cheese and herbs.

If you’re looking for the ultimate comfort breakfast that feeds a crowd and tastes like home, this Breakfast Casserole is it. Loaded with fluffy eggs, savory sausage, melty cheese, and crispy hash browns, it’s the kind of dish that makes mornings feel special.

Perfect for Sunday brunch, holidays, or meal prep, this casserole can be made ahead of time and baked fresh in the morning — so you can spend more time enjoying coffee and less time in the kitchen. Start your morning with a warm breakfast casserole, then try fluffy pancakes or freezer-friendly breakfast burritos for a delicious weekend spread.

Recipe Card

Servings: 8 Prep Time: 15 minutes Cook Time: 45 minutes Total Time: 1 hour

Ingredients

  • 1 lb breakfast sausage (or bacon), cooked and crumbled

  • 6 large eggs

  • 2 cups shredded cheddar cheese

  • 1 (20 oz) bag frozen hash browns, thawed

  • 1 cup milk

  • ½ cup diced onion (optional)

  • ½ cup bell pepper, chopped (optional)

  • ½ teaspoon salt

  • ¼ teaspoon black pepper

  • ¼ teaspoon garlic powder

Instructions

  1. Preheat Oven: Preheat your oven to 350°F. Grease a 9x13-inch baking dish with butter or nonstick spray.

  2. Cook the Sausage: In a large skillet, cook the sausage over medium heat until browned. Drain excess grease and set aside.

  3. Assemble the Casserole: Spread the hash browns evenly in the prepared baking dish. Layer the cooked sausage on top, followed by half the cheese. Add onions and peppers if using.

  4. Make the Egg Mixture: In a large bowl, whisk together eggs, milk, salt, pepper, and garlic powder. Pour evenly over the casserole.

  5. Top and Bake: Sprinkle the remaining cheese on top. Bake uncovered for 40–45 minutes, or until the eggs are set and the top is golden brown.

  6. Serve: Let it rest for 5 minutes before slicing. Serve warm with salsa, sour cream, or a side of fresh fruit.

Tips for the Perfect Breakfast Casserole

  • Assemble the night before and refrigerate overnight for easy mornings.

  • Add spinach, mushrooms, or diced ham for variety.

  • For a spicy kick, use pepper jack cheese or add diced jalapeños.

  • Leftovers keep well — store covered in the fridge for up to 4 days or freeze in portions.

Final Thoughts

This Hearty Breakfast Casserole is the perfect dish to make any morning feel special — simple to prepare, full of flavor, and sure to please everyone at the table.

Whether it’s a lazy weekend or a holiday brunch, this recipe brings all the comfort and warmth of homemade cooking right to your plate.

FAQ

Q: Can I make this breakfast casserole ahead of time? Yes — this casserole is perfect for overnight prep. Assemble it, refrigerate, and bake in the morning.

Q: Can I freeze breakfast casserole? Absolutely — freeze before or after baking for up to 2 months. Thaw overnight for best results.

Q: What meat works best? Sausage, bacon, ham, or a combination all work great.

Q: Can I add vegetables? Yes — peppers, onions, spinach, and mushrooms add great flavor.

Q: Why is my casserole watery? Too many vegetables or underbaked eggs can cause excess moisture. Drain veggies well and bake until fully set.

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