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Overnight Sausage and Potato Breakfast Casserole for Busy Mornings

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If you want a comforting, crowd-pleasing holiday morning dish, this Make-Ahead Sausage and Potato Breakfast Casserole will quickly become a favorite. It’s warm, cheesy, easy to prepare, and can be assembled ahead of time so your morning stays relaxed and stress-free.

This version uses shredded hash browns for the base. If you prefer a bread-based casserole, try an overnight bread casserole instead.

What makes this casserole so good:

✓ golden hash browns

✓ seasoned breakfast sausage

✓ melty mozzarella and sharp cheddar

✓ custardy eggs bound with rich mascarpone for a silky texture

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👝 How to Store Leftovers

Store any leftover casserole in an airtight container in the refrigerator for 3–5 days. Reheat individual portions in the microwave or warm a larger piece in a 350°F oven until heated through.

❄️ Ingredient Swap: Mascarpone vs. Sour Cream

If you don’t have mascarpone or prefer a tangier profile, substitute sour cream cup-for-cup.

Swap Ratio: 1:1 — replace mascarpone with the same amount of sour cream.

Flavor notes:

  • Mascarpone = ultra creamy, rich, slightly sweet and luxurious
  • Sour cream = tangier and lighter, still delicious

Optional: Stir in 1 tablespoon of softened cream cheese to the sour cream for added richness.

Tips & Tricks

  • Bring mascarpone to room temperature for easier blending.
  • Lightly beat the eggs first to avoid over-mixing later.
  • The mix of mozzarella and sharp cheddar gives both creaminess and flavor brightness.
  • Thawed hash browns layer and bake more evenly than frozen.
  • Let the casserole rest 10 minutes after baking for clean slices.

Items Featured

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🤔 Common Questions

Can I make this breakfast casserole ahead of time?

Yes. Assemble the casserole, cover tightly, and refrigerate overnight. In the morning, let it sit at room temperature for 20–30 minutes, then bake as directed.

Do I have to thaw the hash browns first?

Yes. Thawing helps the casserole bake evenly and prevents excess moisture that can make the center undercooked.

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Make-Ahead Sausage and Potato Breakfast Casserole

This cozy, cheesy casserole comes together easily and can be prepared the night before for a relaxed holiday morning.

Highlights:

✓ Golden hash browns ✓ Flavorful sausage ✓ Melty cheeses ✓ Custardy eggs with mascarpone

5 from 1 vote
Print Recipe
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Prep Time 15 mins
Cook Time 35 mins
Total Time 50 mins

Course Main Course
Cuisine American

Servings 5 people

Ingredients

  

  • 1 lb ground breakfast sausage
  • 1 30–32 oz bag frozen shredded hash browns, thawed
  • 8 large eggs
  • 8 oz mascarpone cheese must be room temperature
  • 1 ½ cups freshly shredded mozzarella
  • 8 oz freshly shredded sharp cheddar
  • 1 –2 tablespoons chopped fresh chives plus extra for topping
  • Salt & freshly cracked black pepper to taste
  • Optional: ½–1 teaspoon Italian seasoning
  • Nonstick spray for greasing the baking dish

Instructions

 

Cook the Sausage

  • Brown the ground sausage in a skillet over medium heat, breaking it into small crumbles. Drain excess grease and let cool slightly.

Prep the Egg & Mascarpone Mixture

  • In a large bowl, lightly beat the eggs with a fork.
  • Add room-temperature mascarpone and press it along the sides of the bowl with a fork to break it down.
  • Season with salt, pepper, and optional Italian seasoning. Whisk until almost incorporated; a few small lumps are fine.

Assemble the Casserole

  • Grease a 9×13-inch baking dish with nonstick spray or butter.
  • Layer thawed hash browns in the dish, season with salt and pepper, and toss to coat evenly.
  • Sprinkle a handful of mozzarella over the hash browns.
  • Spread the cooked sausage evenly over the cheese layer.
  • Lightly sprinkle cheddar, then pour the egg-mascarpone mixture evenly over the dish.
  • Top with the remaining mozzarella and cheddar and scatter 1–2 tablespoons chopped chives over the top.

Bake

  • Bake at 350°F for 45–55 minutes, or until the center is set and the top is lightly golden.

Rest & Serve

  • Let the casserole rest for 10 minutes before slicing.
  • Sprinkle extra fresh chives on top before serving.
Keyword best casserole, breakfast casserole, potato breakfast casserole


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