Pioneer Woman's Best Overnight Breakfast Casserole

I’ve made this casserole a dozen times for holiday mornings and busy weekends — it’s the kind of dish that feeds a crowd, reheats beautifully, and smells like a bakery-cafe when it comes out of the oven. Pioneer Woman’s Best Overnight Breakfast Casserole layers browned sausage, crispy bacon, thawed hash browns, and plenty of cheddar in a custardy egg base so you can prep it the night before and wake up to a ready-to-bake brunch. If you enjoy reliable make-ahead breakfasts, this is a go-to, and it sits nicely alongside other overnight favorites like our make-ahead breakfasts that simplify hectic mornings.

Why you’ll love this dish

This casserole hits a lot of marks: it’s make-ahead, crowd-pleasing, and forgiving. Because the eggs are mixed with milk and Dijon, the center bakes into a creamy custard while the edges get golden and set — no rubbery eggs here. Use it for holiday brunch, weekend company, or a labor-saving weekday breakfast when you’ve got hungry kids or a house full of adults.

“Serves a crowd, keeps well, and everyone asks for the recipe — the perfect lazy-elegant breakfast.” — a repeat-tester review

Practical benefits:

Make-ahead convenience: assemble the night before, bake in the morning.
Feeds many: a 9×13 pan is great for potlucks or family gatherings.
Flexible: swap proteins or cheeses to suit taste or pantry limits.
If you like hearty casseroles, compare flavor profiles with our popular crack breakfast casserole for another reliable crowd-pleaser.

Preparing Pioneer Woman’s Best Overnight Breakfast Casserole

Step-by-step overview:

Brown the sausage and crisp the bacon separately; drain well.
Whisk eggs, milk, Dijon, salt, and pepper into a custard.
Layer thawed shredded potatoes, half the cheese, sausage, bacon, and green onions in a greased 9×13 pan.
Pour the egg mixture over the layers, press gently so the potatoes soak up the custard, cover, and refrigerate overnight.
Top with remaining cheese and bake the next morning until set and golden.

This short roadmap helps you prep faster: cook the proteins first, mix the custard last, and refrigerate so flavors meld overnight — similar assembly logic works well in other comfort casseroles like the Pioneer Woman chicken rice casserole.

What you’ll need

10 large eggs — the foundation that binds everything together with a rich, creamy texture.
1.5 cups milk — turns eggs into a luscious custard, making the casserole oh-so-moist. (Use whole milk for best richness; 2% is fine.)
1 tbsp Dijon mustard — a subtle tang that elevates the savory flavors.
1 tsp salt — essential for bringing out the best in every ingredient.
0.5 tsp coarse ground pepper — just enough warmth to enhance the flavors.
1 lb bulk breakfast sausage — savory star, browned for maximum flavor. (Turkey or chicken sausage can be substituted for a lighter dish.)
8 slices bacon, diced — crispy, smoky goodness, used for mixing and topping.
20 oz shredded potatoes/hash browns, thawed — soaks up flavors and bakes into tender morsels. (If using frozen cubed potatoes, pat dry and spread thinner.)
8 oz cheddar cheese, grated, divided — half for mixing, half for topping. Sharp cheddar gives more flavor; use mild for a softer profile.
0.25 cup green onions, sliced — adds a pop of color and fresh brightness.

Ingredient notes: If you prefer a lower-fat protein, swap the bulk sausage for shredded rotisserie chicken; see our best recipes using chicken breast for ideas on timing and seasoning.

Step-by-step instructions

Preheat your oven to 350°F (175°C) only when you’re ready to bake. For overnight prep, wait to preheat.
In a large skillet over medium-high heat, brown the bulk sausage until no pink remains. Transfer to paper towels and drain.
In the same skillet, cook diced bacon until crisp. Drain on paper towels and reserve half for topping.
In a large bowl, whisk together 10 eggs, 1.5 cups milk, 1 tablespoon Dijon, 1 teaspoon salt, and 1/2 teaspoon coarse ground pepper until well combined.
Grease a 9×13-inch baking dish. Spread the thawed shredded potatoes evenly across the bottom. Sprinkle half (4 oz) of the grated cheddar over the potatoes.
Scatter the browned sausage and most of the cooked bacon over the cheese layer. Add sliced green onions.
Pour the egg mixture evenly over everything, pressing gently so the potatoes absorb the custard.
Cover tightly with plastic wrap or foil and refrigerate overnight (or at least 4 hours).
When ready to bake, remove wrap and let the casserole sit at room temperature 15–20 minutes while the oven heats to 350°F (175°C). Sprinkle the remaining cheese and reserved bacon on top.
Bake uncovered for 45–55 minutes, or until the center is set and the top is golden. An instant-read thermometer in the center should read at least 160°F.
Let rest 10 minutes before slicing to finish setting. Garnish with extra green onions if desired.

For serving inspiration or a warm bowl alongside, consider simple soups that pair nicely with rich casseroles; our guide to best winter soups has complementary ideas.

Best ways to enjoy it

Slice and serve with a mixed green salad and a bright vinaigrette to cut the richness.
Offer hot sauce, salsa, or sour cream on the side for guests who like extra tang.
For a brunch buffet, place the casserole on a warming tray and serve with flaky biscuits or toast.
Turn individual portions into sandwiches with toasted English muffins or crusty rolls for an on-the-go breakfast.

Plating tip: use a serrated knife to get clean slices. A small spatula makes removing portions tidy when serving a crowd.

Storage and reheating tips

Refrigerate leftovers in an airtight container within two hours of baking. Eat within 3–4 days.
To reheat, slice and warm individual portions in a 350°F oven for 10–15 minutes or microwave on medium power for 1–2 minutes until heated through.
To freeze: cool completely, wrap tightly in plastic and foil, or portion into freezer-safe containers. Freeze up to 3 months. Thaw in the fridge overnight before reheating.
Food safety: Cooked egg casseroles should reach an internal temperature of 160°F to be safe. When reheating, confirm the center reaches 165°F.

Pro chef tips

Drain cooked sausage and bacon well — excess grease can make the casserole soggy. Blot with paper towels.
Don’t overwhisk the eggs. Combine until homogeneous; overbeating introduces excess air which can make the custard overly puffy and uneven.
Press the potatoes gently after pouring the custard to encourage even absorption — this yields a creamier center.
Use sharp cheddar for deeper flavor; older cheeses melt differently, so grate your own rather than buying pre-shredded (it melts better thanks to no anti-caking agents).
If your hash browns are very wet after thawing, squeeze out excess moisture with a towel to avoid a watery bake.

Creative twists

Vegetarian: omit sausage and bacon, add sautéed mushrooms, roasted red peppers, and spinach; swap turkey bacon if you want smoky flavor without pork.
Tex-Mex: stir in a can of drained diced green chiles, swap pepper jack for cheddar, and top with cilantro, jalapeños, and salsa.
Italian: use Italian sausage, swap cheddar for mozzarella, and add a spoonful of pesto over the top before serving.
Lower-carb: replace shredded potatoes with 10–12 cups of chopped cauliflower florets (lightly roasted first) and bake the same way.
Make it mini: divide into greased muffin tins for portable breakfast bites; reduce baking time to 20–25 minutes.

Your questions answered

Q: Can I assemble this casserole the morning I plan to serve it?
A: Yes. If you bake the same day, let it sit in the fridge 30–60 minutes after assembling before baking so the custard absorbs into the potatoes; you may need slightly less baking time.

Q: Can I use frozen, not-thawed hash browns?
A: Thawing is recommended. If you use frozen, expect more liquid in the pan — squeeze excess moisture and increase bake time until set.

Q: Is this safe to eat cold?
A: No. This recipe contains eggs and meat and should be reheated to 165°F before eating. Cold leftovers should be eaten only after proper refrigeration and reheating.

Q: How do I keep the top from burning while the center finishes cooking?
A: If the top browns too quickly, tent loosely with foil for the remaining bake time.

Q: Can I scale the recipe down for a smaller family?
A: Yes — halving the recipe fits a smaller baking dish (approximately 8×8) and will shorten bake time; check doneness with a thermometer.

Conclusion

If you want the original inspiration alongside helpful notes and a tested method, see the detailed version on this Pioneer Woman Breakfast Casserole write-up on Gonna Want Seconds. For Ree Drummond’s take with commentary and make-ahead tips, check out the review at Simply Recipes’ Ree Drummond sausage casserole review. And if you want a slightly different official spin straight from the source, read Ree’s Cowboy Breakfast Casserole recipe on The Pioneer Woman for comparison and serving ideas.