If your mornings are chaos and you need a breakfast that stretches across the whole week, this overnight breakfast casserole is exactly what you’re after.
It’s built for a big batch: one dish feeds the whole family for several days, and it reheats just as well on day four as it did the morning you baked it.
You mix everything the night before, let it sit in the fridge, then pop it in the oven while everyone’s getting dressed. Below you’ll find the full recipe, plus a bread-based variation, a crockpot option, and the exact way to store and reheat it so it doesn’t dry out.
Overnight Breakfast Casserole Recipe
A hearty overnight breakfast casserole loaded with sausage, bacon, hash browns, and melty cheddar. Assemble it the night before, then just pop it in the oven in the morning for an easy, crowd-pleasing breakfast — perfect for holidays or weekend guests.
Ingredients
- 1 lb breakfast sausage
- 4 slices bacon, chopped
- 1 (30 oz) bag frozen shredded hash browns, thawed
- 8 large eggs
- 1 1/2 cups milk
- 2 cups shredded cheddar cheese, divided
- 1/2 cup diced onion
- 1/2 cup diced bell pepper (optional)
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon garlic powder
Instructions
- Cook the sausage and bacon in a skillet over medium heat until browned, about 8 minutes. Drain any excess grease.
- Grease a 9x13-inch baking dish and spread the hash browns evenly across the bottom.
- Layer the cooked sausage, bacon, onion, and bell pepper over the hash browns. Sprinkle half the cheese on top.
- In a large bowl, whisk together the eggs, milk, salt, pepper, and garlic powder.
- Pour the egg mixture evenly over the casserole, then top with the remaining cheese.
- Cover tightly with foil or plastic wrap and refrigerate overnight, or for at least 4 hours.
- The next morning, preheat the oven to 350°F. Remove the cover and bake for 45 to 50 minutes, until the eggs are set and the top is golden.
- Let it rest for 5 minutes before slicing and serving.
Nutrition Information:
Yield:
8Serving Size:
1Amount Per Serving: Calories: 587Total Fat: 45gSaturated Fat: 20gUnsaturated Fat: 25gCholesterol: 307mgSodium: 1342mgCarbohydrates: 10gFiber: 1gSugar: 2gProtein: 35g
Ingredient Swaps
- Sausage swap: use turkey sausage for a lighter option, or skip the meat and add extra veggies for a vegetarian version.
- Hash brown swap: cubed frozen diced potatoes work the same way if that’s what you’ve got in the freezer.
- Cheese swap: pepper jack if your family likes a little kick, or a Mexican blend for a Tex-Mex twist.
Storage and Reheating
Store leftovers covered in the fridge for up to 5 days. This is actually one of the reasons this casserole works so well for busy weeks: it reheats without turning rubbery or dried out.
Microwave individual squares for 60 to 90 seconds, or reheat a larger portion in a 325°F oven for about 15 minutes covered in foil. It freezes well too. Wrap individual portions and freeze for up to 2 months, then thaw overnight in the fridge before reheating.
Different Ways to Make It
Bread-based version: Swap the hash browns for 6 cups of cubed day-old bread (French bread works great). Layer it the same way. Bread soaks up the egg mixture more than hash browns, so letting it sit overnight actually gives you a better texture.
Crockpot version: Layer everything in a greased slow cooker instead of a baking dish, pour the egg mixture over the top, and cook on low for 6 to 7 hours. This one doesn’t require overnight prep if you’re short on fridge space, though you can still assemble it the night before if that’s easier for your schedule.
FAQ
Can I make this overnight breakfast casserole ahead of time?
Yes, that’s the whole point of this recipe. Assemble it the night before, keep it covered in the fridge, and bake it fresh in the morning.
Can I freeze breakfast casserole?
Yes. Bake it first, let it cool completely, then wrap individual portions and freeze for up to 2 months. Thaw in the fridge overnight before reheating.
What can I use instead of hash browns?
Cubed bread or diced frozen potatoes both work well as a swap. See the Different Ways to Make It section above for exact amounts.
How long does breakfast casserole keep in the fridge?
Once baked, it keeps well covered in the fridge for up to 5 days, which makes it a solid pick for a week of easy mornings.
Can I make this in a crockpot?
Yes. Layer the same ingredients in a slow cooker and cook on low for 6 to 7 hours. Full instructions are above.
Can I make this vegetarian?
Skip the sausage and bacon and add extra vegetables like spinach, mushrooms, or diced tomatoes instead. Everything else stays the same.
Why did my casserole turn out watery?
This usually happens if the hash browns weren’t fully thawed, or if there’s too much grease left on the sausage and bacon before layering. Drain the meat well and pat the hash browns dry with a paper towel if they seem wet.
Can I double this recipe for a crowd?
Yes, just use two 9×13 dishes rather than one larger pan, so it bakes evenly, and add a few extra minutes to the bake time if needed.
Conclusion
This overnight breakfast casserole solves the exact problem busy families run into: needing a big breakfast that actually holds up over several mornings instead of turning into a sad, dried-out reheat.
Assemble it once, and you’ve got a filling breakfast ready to go for most of the week, whether you bake it fresh or make the crockpot version. Give the hash brown version a try first, then swap in bread or the slow cooker method once you know which fits your mornings best.
