Make Ahead Biscuit Breakfast Casserole

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I’m a big believer that the best mornings start the night before, and this Make Ahead Biscuit Breakfast Casserole is exactly that kind of recipe. It’s packed with savory breakfast sausage, colorful peppers, and fluffy biscuit pieces all baked together in a creamy egg and cheese custard. You do the work when you’re not rushed, then wake up to a bubbling, golden pan of comfort.

This casserole has become my go-to for holiday breakfasts, busy school mornings, and lazy Sunday brunch with friends. I can assemble it after dinner, tuck it into the fridge, and then just pop it in the oven while the coffee brews. If your family loves cozy casseroles like my chicken bubble biscuit bake casserole, this one will fit right in on your table.

Why You’ll Love This Make Ahead Biscuit Breakfast Casserole

I love a breakfast that feels special but doesn’t make me juggle a dozen pans before 8 a.m. This casserole checks every box:

• Make-ahead friendly. Assemble it completely the night before so the biscuits can soak up all that flavorful egg mixture.
• Hearty and filling. With sausage, eggs, cheese, and biscuits, one square really sticks with you.
• Perfect for feeding a crowd. One pan easily serves a hungry group without you standing at the stove.
• Flexible. Swap the veggies, change the cheese, or use turkey sausage—this recipe loves a little customization.
• Great for leftovers. The squares reheat beautifully for quick breakfasts or breakfast-for-dinner later in the week.

Can I Really Make This Biscuit Breakfast Casserole Ahead of Time?

Yes, you absolutely can—and honestly, I think it tastes even better that way. When the unbaked casserole rests in the fridge overnight, the biscuits soak up some of the egg and milk mixture. That time gives you a custardy center with crisp, golden edges instead of dry biscuits floating in eggs.

I usually assemble the whole dish, cover it tightly, and refrigerate for 8–12 hours. In the morning, I pull it out while the oven preheats so it can take the chill off, then bake until puffed and deeply golden. If you’re really short on time, you can bake it right away, but the texture is at its best when it has at least a couple of hours to rest.

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Ingredients for the Make Ahead Biscuit Breakfast Casserole

Before I assemble this casserole, I like to pull everything out and chop the veggies so it comes together fast. Here’s what I use and why each ingredient matters.

• Breakfast sausage – Brings all the savory, meaty flavor and plenty of protein to keep everyone full.
• Refrigerated buttermilk biscuits – These are the base of the casserole, turning soft and fluffy inside with golden, buttery tops.
• Eggs – Create the custardy structure that holds everything together.
• Whole milk – Adds creaminess to the egg mixture without making it overly heavy.
• Shredded sharp cheddar cheese – Melts into gooey, cheesy pockets throughout the casserole and on top.
• Red bell pepper – Adds sweetness, color, and a little crunch.
• Green bell pepper – Brings a slightly sharper pepper flavor that balances the richness.
• Yellow onion – Softens and sweetens as it bakes, adding depth to the sausage.
• Kosher salt – Seasons the eggs and biscuits so every bite tastes just right.
• Black pepper – Gives a gentle warmth that pairs beautifully with the sausage.
• Garlic powder – Adds savory flavor without needing to mince fresh garlic.
• Smoked paprika – Brings a hint of smokiness and beautiful color on top.
• Crushed red pepper flakes (optional) – For a little kick if your crew likes some heat.
• Butter or nonstick spray – Keeps the casserole from sticking and helps the edges crisp up.

How To Make the Make Ahead Biscuit Breakfast Casserole

Once everything is prepped, this recipe is mostly a little browning, a bit of whisking, and some layering. Here’s exactly how I put it together.

Step 1: Prep the baking dish
Grease a 9×13-inch baking dish with butter or nonstick spray. I like to be generous around the corners and edges so the cheesy bits get crispy but still release easily.

Step 2: Brown the sausage
In a large skillet over medium heat, cook the breakfast sausage, breaking it into crumbles as it browns. When it’s cooked through with no pink remaining, drain off excess grease if needed and set the sausage aside.

Step 3: Soften the veggies
In the same skillet, add the diced onion and bell peppers. Sauté for 4–5 minutes, just until they start to soften and pick up a little color. This step takes off the raw bite and builds flavor.

Step 4: Cut the biscuits
Open the can of refrigerated biscuits and cut each biscuit into 6–8 pieces. Scatter the biscuit pieces evenly over the bottom of the greased baking dish, making sure they’re in a single layer.

Step 5: Layer sausage, veggies, and cheese
Sprinkle the cooked sausage evenly over the biscuit pieces, followed by the sautéed peppers and onions. Top with most of the shredded cheddar cheese, reserving a small handful for the top.

Step 6: Mix the egg custard
In a large bowl, whisk together the eggs, whole milk, salt, pepper, garlic powder, smoked paprika, and red pepper flakes (if using) until well combined and smooth.

Step 7: Pour and chill
Slowly pour the egg mixture evenly over the biscuit and sausage layers, making sure everything is moistened. Gently press down any pieces that want to float. Sprinkle the remaining cheese over the top. Cover the dish tightly with plastic wrap or foil and refrigerate for at least 2 hours, or overnight for the best make-ahead texture.

Step 8: Bake to golden perfection
When you’re ready to bake, remove the casserole from the fridge and let it sit at room temperature while the oven preheats to 350°F (175°C). Uncover the dish and bake for 40–50 minutes, or until the eggs are set in the center and the top is deeply golden and puffed.

Step 9: Rest and serve
Let the casserole rest for about 10 minutes before slicing so it can firm up and slice into neat squares. Garnish with a little fresh parsley if you like, then serve warm.

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How to Serve and Store This Biscuit Breakfast Casserole

This 9×13-inch Make Ahead Biscuit Breakfast Casserole comfortably feeds about 8 people as a main dish, or up to 10–12 if you’re serving it alongside other breakfast items.

For serving, I like to cut the casserole into squares and add a little hot sauce, salsa, or a spoonful of sour cream on the side. A fruit salad or a warm basket of soft and fluffy milk bread makes it feel like a full brunch spread.

To store leftovers, let the casserole cool to room temperature, then cover the dish or transfer slices to an airtight container. It keeps in the fridge for up to 4 days. Reheat individual portions in the microwave, or warm several pieces together in a 325°F oven until heated through.

You can also freeze baked squares for up to 2 months. Wrap each square tightly, then stash them in a freezer bag. Thaw overnight in the fridge before reheating so they warm evenly.

What to Serve With Make Ahead Biscuit Breakfast Casserole?

When I want to turn this into a full breakfast or brunch, here are some of my favorite pairings:

1. Fresh fruit or a simple fruit salad – The brightness balances the richness of the casserole.
2. Crispy potatoes or hash browns – You can even skip the frying and use my oven or air fryer methods while the casserole bakes.
3. More egg favorites – For a big brunch buffet, pair it with something lighter like my air fryer egg and cheese toast.
4. Another cozy casserole – If you’re feeding a serious crowd, you can bake a pan of creamy keto broccoli chicken casserole on the side so there’s something for everyone.

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Frequently Asked Questions

Can I use homemade biscuits instead of canned?
Yes, you can swap in homemade biscuits if you’d like. Bake a batch, let them cool, then cut them into bite-size pieces. Because homemade biscuits are often a bit drier than canned, I suggest slightly increasing the milk in the egg mixture (by about 1/4 cup) so they have enough moisture to soak up.

What kind of sausage works best?
I usually use mild pork breakfast sausage, but you can absolutely use hot sausage if you love heat, or swap in turkey or chicken sausage for something a little lighter. Just make sure to fully cook and crumble the sausage before adding it to the casserole.

Do I have to let the casserole sit overnight?
Overnight rest gives you the best texture, but it’s not strictly required. If you’re short on time, let the assembled casserole sit for at least 30–60 minutes before baking. The biscuits won’t soak up quite as much of the custard, but it will still be delicious.

How do I keep the bottom from getting soggy?
Make sure your sausage is well drained so extra grease doesn’t pool in the bottom of the pan. Baking the casserole uncovered helps excess moisture evaporate and encourages a golden, slightly crisp top. Also, avoid adding extra liquid-heavy vegetables without sautéing them first.

Can I halve the recipe?
Yes, this recipe halves beautifully. Assemble it in an 8×8-inch or similar baking dish, using half of each ingredient. The bake time will be a little shorter—start checking for doneness around 30–35 minutes.

Save This Pin For Later

📌 Save this Make Ahead Biscuit Breakfast Casserole to your Pinterest breakfast board so you can come back to it any time.

And when you make it, come back and tell me how it went! Did you add extra veggies or swap the sausage for bacon? Did you bake it right away or let it rest overnight?

I love hearing how you make these recipes your own. Questions are always welcome too—let’s help each other cook breakfast smarter, not harder. If you need more cozy casserole inspiration after this one, you might also love my chicken bubble biscuit bake casserole for another biscuit-filled favorite.

Conclusion

This Make Ahead Biscuit Breakfast Casserole has become one of those recipes I rely on whenever I want a comforting, no-stress breakfast that still feels special. It’s hearty enough for holidays, simple enough for busy weekdays, and flexible enough to fit whatever is already in your fridge.

If you try it, I’d love to hear what your family thinks and how you customize it—extra cheese, different veggies, or even a mix of sausage and bacon. And if you’re looking for even more everyday breakfast and brunch inspiration, you can follow along on Pinterest at Life With Rosa where I share all of my latest recipes and ideas.

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