Overnight Breakfast Casserole with Sausage, Cheddar, and Bell Peppers Recipe

There is something truly magical about waking up to a warm, savory breakfast that has been quietly baking overnight, ready to greet you with comforting flavors. The Overnight Breakfast Casserole with Sausage, Cheddar, and Bell Peppers Recipe is exactly that kind of dish—a delightful, hearty bake combining the spicy kick of sausage, the creamy melt of cheddar, and the crunch and color from fresh bell peppers. It’s the perfect solution for busy mornings or leisurely weekends when you want to impress family and friends without fussing over the stove. Trust me, once you try this recipe, it will become a beloved staple in your breakfast rotation.

Ingredients You’ll Need

This recipe uses simple but essential ingredients that work together in perfect harmony to build flavors and layers of texture. Each component plays a role—from the juicy sausage to the fluffy egg custard, and the melty cheddar cheese to the subtle sweetness of bell peppers, creating a balanced and colorful breakfast bake that’s as pleasing to the eye as it is to the palate.

• Breakfast sausage (1 lb): Provides a savory and slightly spicy base that brings richness to the dish.
• Bread cubes (8 slices): Acts as the absorbent base that soaks up all the delicious egg mixture.
• Shredded cheddar cheese (2 cups): Adds creamy, melted goodness with a sharp and tangy flavor.
• Large eggs (8): Create the custard that binds the casserole together with a rich, silky texture.
• Milk (2 cups): Helps lighten the egg mixture and makes the casserole tender and moist.
• Dijon mustard (1 teaspoon): Introduces a subtle tang and depth without overpowering.
• Salt (1 teaspoon): Enhances all the individual flavors beautifully.
• Black pepper (½ teaspoon): Adds a gentle peppery heat to awaken the taste buds.
• Paprika (½ teaspoon): Contributes a mild smoky note and vibrant color.
• Diced bell peppers (1 cup, optional): Offer a sweet crunch and colorful brightness that brighten the dish.
• Diced onions (1 cup, optional): Give an added layer of sweetness and texture.
• Fresh herbs (optional): Sprinkle on top as a fresh, aromatic garnish to finish.

How to Make Overnight Breakfast Casserole with Sausage, Cheddar, and Bell Peppers Recipe

Step 1: Brown the Sausage

Start by gently cooking the crumbled breakfast sausage in a large skillet over medium heat until it’s browned and cooked through. Breaking up the sausage as it cooks helps it brown evenly and develop that savory flavor foundation. Once done, drain any excess grease and set it aside to cool slightly—this prevents the casserole from becoming greasy.

Step 2: Prepare the Baking Dish

Next, either grease a 9×13 inch baking dish or spray it with non-stick cooking spray. This simple step ensures your casserole will release easily once baked, preserving the beautiful layers you’ve worked on.

Step 3: Layer Bread and Sausage

Spread the cubed bread evenly across the bottom of your prepared dish. If you’re including sausage, sprinkle it evenly over the bread. This layering is crucial because the bread acts like a sponge and soaks up the egg mixture overnight, turning wonderfully custardy as it cooks.

Step 4: Whisk the Egg Mixture

In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, black pepper, and paprika until completely blended. This combination creates the rich, flavorful custard that will bind the entire dish together and give it that irresistible texture.

Step 5: Combine and Press

Pour the egg mixture evenly over the bread and sausage layers. Gently press down on the bread cubes to help them absorb the liquid—this little trick makes sure every bite is packed with flavor and moisture.

Step 6: Add Cheese and Veggies

Sprinkle the shredded cheddar cheese evenly on top for that gooey, melty finish. If you’re using diced bell peppers and onions, toss those on now as well. These add an extra pop of color and texture that makes this casserole a feast for all the senses.

Step 7: Refrigerate Overnight

Cover the dish tightly with plastic wrap and pop it into the fridge overnight. This resting time allows the bread to soak up the egg mixture fully, ensuring a creamy, custardy center and a perfectly tender bite the next morning.

Step 8: Bake the Casserole

When you’re ready to bake, preheat your oven to 350°F (175°C). Remove the plastic wrap and bake the casserole for 45 to 55 minutes, until the center is set and the top turns a gorgeous, golden brown. A toothpick inserted into the middle should come out clean—that’s your cue that it’s perfectly cooked.

Step 9: Rest and Garnish

Let the casserole cool for about 10 minutes before slicing—this rest time lets it firm up just enough for neat slices. Garnish with fresh herbs if desired, adding a burst of freshness and vibrant color to each serving.

How to Serve Overnight Breakfast Casserole with Sausage, Cheddar, and Bell Peppers Recipe

Garnishes

A sprinkle of freshly chopped parsley, chives, or even a little cilantro can elevate the look and flavor of your casserole. These herbs add a fresh, bright contrast that beautifully balances the rich cheese and savory sausage.

Side Dishes

Serve this casserole alongside some fresh fruit, like juicy berries or sliced melon, to add a refreshing sweetness. A simple green salad or crispy roasted potatoes also complement the hearty flavors wonderfully and make for a well-rounded meal.

Creative Ways to Present

For an inviting brunch spread, you can slice the casserole into squares and serve on a wooden board with small bowls of hot sauce, sour cream, or avocado slices. If you’re hosting a crowd, consider setting it up as a buffet option so guests can help themselves to warm, comforting breakfast goodness.

Make Ahead and Storage

Storing Leftovers

Any leftovers should be cooled to room temperature, then stored in an airtight container in the refrigerator for up to 3 days. This casserole reheats well and makes for a quick breakfast or snack the next day.

Freezing

You can freeze individual portions by wrapping them tightly in plastic wrap and aluminum foil, then placing them in a freezer-safe bag. The casserole keeps well for up to 2 months in the freezer—perfect for meal prepping ahead of busy weeks.

Reheating

To reheat, microwave individual servings on medium power until warmed through or bake slices in a preheated 350°F oven for about 15 minutes. This restores the casserole’s cozy texture and melty cheese, almost like freshly baked.

FAQs

Can I make this casserole without sausage?

Absolutely! You can easily omit the sausage or substitute it with cooked bacon, ham, or even a plant-based sausage to suit your preference or dietary needs. The cheese and egg custard keep the dish flavorful and satisfying.

Is it necessary to refrigerate overnight?

Refrigerating overnight allows the bread to soak up the egg mixture fully, resulting in a creamy, custardy texture. While you could bake it immediately, the casserole won’t have the same depth of flavor or perfect consistency.

Can I use other types of cheese?

Definitely! Feel free to experiment with cheeses like Monterey Jack, pepper jack, or mozzarella for different flavor profiles. Just keep in mind that cheddar adds a nice sharpness that complements the sausage well.

What’s the best bread to use?

A sturdy bread like French, sourdough, or even whole wheat works best because it holds up well after soaking in the egg mixture. Avoid very soft or pre-sliced sandwich bread as it may become too mushy.

Can I add other vegetables?

Yes! Mushrooms, spinach, or zucchini all make fantastic additions and add extra nutrition. Just be sure to sauté firmer vegetables first to release moisture and prevent the casserole from becoming watery.

Final Thoughts

This Overnight Breakfast Casserole with Sausage, Cheddar, and Bell Peppers Recipe is truly a crowd-pleaser that feels special without a ton of effort. The way all the flavors come together after a restful night in the fridge is pure comfort food magic. Whether you’re feeding your family on a busy weekday or hosting a leisurely weekend brunch, this casserole will bring smiles and full bellies. I hope you give it a try and find it as irresistible as I do!

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