Overnight Breakfast Casserole
If you’re looking for the easiest make-ahead breakfast for busy holiday mornings, this Overnight Breakfast Casserole is the one. It’s hearty, cheesy, comforting, made with simple ingredients—frozen hashbrown patties, cooked sausage, eggs, milk, and plenty of melty cheese.
This make ahead cheesy breakfast casserole is perfect for holidays, brunches, busy school mornings, or whenever you want to wake up knowing breakfast is already handled. Plus it’s so delicious! I make this casserole so often, for every occasion, and I especially love it to meal prep for the week.
It takes just a few minutes to assemble the night before. By morning, all that’s left to do is pop it in the oven. No morning prep, no rushing around, no fuss. That’s my type of recipe!
Why You’ll Love It
- Prep-ahead perfection: Assemble the whole thing the night before.
- Feeds a crowd: Great for family gatherings, church brunches, or holiday mornings.
- Kid-friendly: Familiar flavors, simple ingredients, always a hit.
- Customizable: Easy to swap in bacon, ham, veggies, or different cheeses.
What You’ll Need
Find the full, printable recipe with exact measurements at the bottom of this post. Read on for more details and tips!
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- 9×13 Baking Dish
- Nonstick cooking spray
- Hashbrown patties– use straight from frozen! So easy~!
- Ground breakfast sausage– I’m using turkey sausage. You could use chicken sausage, andouille, Italian sausage, or even cubed ham or crumbled bacon.
- Eggs
- Milk– to make the eggs light and fluffy
- Shredded cheese (cheddar, Colby Jack, or a blend)
- Sour Cream- to add extra flavor, tang, and creaminess
- Seasonings– salt, black pepper, garlic powder, paprika
How To Make It
Layer the Hashbrowns
Start by greasing a 9×13 baking dish and laying the frozen hashbrown patties in a single layer across the bottom. These crisp up beautifully as they bake and form the perfect base.
Add the Sausage
Sprinkle the cooked, crumbled sausage evenly on top.
Whisk the Egg Mixture
In a large bowl, whisk together the eggs, sour cream, milk, and seasonings. Pour this mixture evenly over everything in the baking dish. Add the shredded cheese over top. (Cheddar, Colby Jack, Monterey Jack—anything melty works great.)
Refrigerate Overnight
Cover with foil or plastic wrap and refrigerate at least 4 hours or overnight. This gives the hashbrowns time to soften slightly and allows the flavors to meld.
Baking Instructions
In the morning, preheat your oven to 350°F. Uncover the casserole and bake for 45–55 minutes, or until the center is set and the edges are lightly golden.
Let it rest for 10 minutes before slicing. This helps the layers settle and makes it easier to cut.
Cut into slices and enjoy! Serve this breakfast casserole with fresh fruit, a simple green salad, or a side of biscuits. It’s also great with hot sauce, salsa, or a drizzle of maple syrup for that sweet-and-savory vibe.
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Variations
This casserole is incredibly versatile! Here are some favorite ways to change it up:
- Veggie Lover’s Version: Add sautéed bell peppers, onions, mushrooms, or spinach.
- Southwest Style: Use pepper jack cheese and add a can of diced green chiles.
- Meat Swap: Try crumbled bacon or diced ham—or use a combination.
- Everything Bagel Twist: Sprinkle the top with everything bagel seasoning before baking.
FAQ’s
Can I assemble this more than one night in advance?
You can prep it up to 24 hours ahead. Any longer and the hashbrowns may become too soft.
Can I freeze this casserole?
Yes! Assemble it, cover tightly, and freeze before baking. Thaw overnight in the fridge and bake as directed.
Can I use shredded hashbrowns instead of patties?
Absolutely. Use about 4–5 cups of thawed shredded hashbrowns and press them lightly into the bottom before adding the sausage and cheese.
How do I know when it’s done?
The center should be set, not jiggly, and the edges will be lightly golden. A knife inserted in the middle should come out clean.
More Breakfast Ideas
- Pumpkin Chocolate Chip Muffins
- Banana Bread
- Baked Apple Cider Donuts
- Blueberry French Toast Casserole
- 10 Make Ahead Breakfast Ideas
- Breakfast Cookies
- Andouille Sausage Breakfast Casserole
- Slow Cooker Carrot Cake Oatmeal
- Pumpkin Spice Baked Donuts
Wake up to a ready-made breakfast! This Overnight Hashbrown Patty Breakfast Casserole is layered with crispy hashbrown patties, savory sausage, fluffy eggs, and melty cheese. So easy—just assemble the night before and bake in the morning! Great for holidays, brunch, or busy family mornings.
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Overnight Sausage and Egg Breakfast Casserole
Equipment
Ingredients
Method
- Grease a 9×13 baking dish. Arrange hashbrown patties in a single layer. (I cut a hashbrown in half to fir them all the way across)
- Sprinkle cooked sausage on top.
- Whisk together eggs, milk, sour cream, and seasonings. Pour evenly over the casserole.
- Sprinkle over the shredded cheese.
- Cover and refrigerate overnight.
- In the morning, preheat oven to 350°F.
- Bake, uncovered, 45–55 minutes or until center is set.
- Rest 10 minutes before slicing. Enjoy!
- Serve this breakfast casserole with fresh fruit, a simple green salad, or a side of biscuits. It’s also great with hot sauce, salsa, or a drizzle of maple syrup for that sweet-and-savory vibe.
