Wake up to a hearty, crowd-pleasing breakfast! This Overnight Sausage Breakfast Casserole combines eggs, sausage, and cheese for a creamy, comforting dish that’s easy to prep the night before.
Looking for the ultimate breakfast that’s both satisfying and effortless? Meet the Overnight Sausage Breakfast Casserole — your new morning favorite! Picture layers of fluffy eggs, savory sausage, melted cheese, and cubes of bread baked into golden perfection. It’s everything you love about breakfast, all in one comforting dish.
Breakfast casseroles have long been a brunch staple because they’re simple, make-ahead, and perfect for feeding a crowd. This version takes it up a notch — rich, hearty, and customizable with whatever you have in the fridge. Assemble it the night before, and in the morning, all that’s left to do is pop it in the oven and enjoy the delicious aroma filling your kitchen.
If you love hearty breakfast dishes, you might also enjoy our Classic Quiche Lorraine — another timeless dish that brings warmth and elegance to the table.
🍳 What Is Overnight Sausage Breakfast Casserole?
You might be wondering: “What makes this casserole ‘overnight’?” It’s simple — you assemble everything the night before and bake it in the morning. As it chills, the bread soaks up the egg mixture, creating a creamy, custard-like texture once baked.
Think of it as breakfast magic waiting in your fridge! You’ll wake up to a ready-to-bake casserole that transforms into a golden, cheesy masterpiece with minimal effort. Whether it’s for Christmas morning, a weekend brunch, or a busy weekday, this dish delivers comfort and convenience in every bite.
❤️ Why You’ll Love This Recipe
You’ll fall in love with this Overnight Sausage Breakfast Casserole for so many reasons:
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Make-Ahead Magic: Perfect for stress-free mornings — assemble the night before, bake in the morning!
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Crowd-Pleasing Flavor: Savory sausage, gooey cheese, and fluffy eggs — what’s not to love?
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Customizable: Add veggies, swap meats, or mix up the cheese to suit your taste.
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Budget-Friendly: Simple, pantry-staple ingredients that stretch to feed the whole family.
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Meal Prep Hero: Stores and reheats beautifully for several days.
If you enjoyed our Spinach and Mushroom Strata, this casserole offers the same cozy comfort with a meaty twist!
🧂 Ingredients You’ll Need
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1 lb breakfast sausage, crumbled
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8 large eggs
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2 cups milk
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1 teaspoon dried mustard
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1 teaspoon salt
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½ teaspoon black pepper
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6 slices of bread, cut into cubes
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2 cups shredded cheese (cheddar or your favorite variety)
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Optional: chopped bell peppers, onions, or spinach for extra flavor
💡 Tip: For a lighter option, use turkey sausage or plant-based sausage — the results are still delicious!
👩🍳 How to Make Overnight Sausage Breakfast Casserole
Quick Overview
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Prep Time: 30 minutes
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Chill Time: Overnight
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Cook Time: 45 minutes
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Serves: 6–8
Step-by-Step Instructions
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Cook the Sausage: In a large skillet over medium heat, brown the sausage until fully cooked. Drain any excess fat and set aside.
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Whisk the Eggs: In a large bowl, whisk together eggs, milk, dried mustard, salt, and pepper until well combined.
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Assemble the Casserole: In a greased 9×13-inch baking dish, layer the bread cubes, cooked sausage, and optional vegetables. Pour the egg mixture evenly over the top.
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Add Cheese: Sprinkle the shredded cheese evenly to cover the casserole.
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Chill Overnight: Cover with foil or plastic wrap and refrigerate overnight to allow flavors to blend and bread to absorb the custard.
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Bake: The next morning, preheat the oven to 350°F (175°C). Uncover and bake for 45 minutes, or until golden and set in the center.
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Serve: Let cool slightly, then slice into squares and serve warm.
🍴 What to Serve It With
Round out your breakfast with simple, fresh sides:
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🍓 Fresh fruit salad — adds brightness and balance
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🥔 Crispy hash browns or roasted breakfast potatoes
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🥗 Light green salad for a savory contrast
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☕ Freshly brewed coffee, tea, or orange juice for the perfect pairing
🌟 Tips for Perfect Results
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Ingredient Swaps: Use turkey sausage or veggie crumbles for a healthier twist.
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Texture Control: Want a firmer casserole? Reduce the milk slightly or let it chill a bit longer before baking.
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Avoid Sogginess: Always drain cooked sausage well before assembling.
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Rest Before Serving: Let the casserole sit for 5–10 minutes after baking — this helps it set and makes slicing easier.
🧊 Storing & Reheating
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Store: Keep leftovers in an airtight container in the refrigerator for up to 3–4 days.
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Freeze: For long-term storage, freeze individual portions for up to 2 months.
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Reheat: Warm in the oven at 350°F (175°C) until heated through, or microwave individual servings for about 1–2 minutes.
Overnight Sausage Breakfast Casserole
Ingredients
Main Ingredients
- 1 pound breakfast sausage, crumbled
- 8 large eggs
- 2 cups milk
- 1 teaspoon dried mustard
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 6 slices bread, cut into cubes
- 2 cups shredded cheese (cheddar or your favorite)
- Optional: chopped veggies like bell peppers, onions, or spinach Customize to your liking
Instructions
Preparation
- In a skillet over medium heat, cook the crumbled sausage until browned and fully cooked. Drain excess fat, if necessary, and set aside.
- In a large bowl, whisk together the eggs, milk, mustard, salt, and pepper until well combined.
- In a greased 9x13 inch baking dish, layer the bread cubes, followed by the cooked sausage and your chosen vegetables if using.
- Pour the egg mixture over everything, ensuring the bread is fully coated.
- Sprinkle the shredded cheese evenly over the top of the casserole.
- Cover the dish with foil or plastic wrap and refrigerate overnight to allow the flavors to meld and the bread to soak up the egg mixture.
- The next morning, preheat your oven to 350°F (175°C). Remove the cover and bake the casserole for about 45 minutes or until the center is set and the top is golden.
- Let it cool slightly, slice into squares, and serve warm.
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