Name: Sausage Egg Breakfast Casserole
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Yield: 8 servings
Ingredients: 1 pound bulk breakfast sausage; 1 medium yellow onion, diced; 1 medium red bell pepper, diced; 8 large eggs; 2 cups whole milk; 1 teaspoon kosher salt; 1/2 teaspoon black pepper; 1 teaspoon dry mustard powder; 6 cups cubed day-old French bread; 2 cups shredded sharp cheddar cheese, divided; 1 tablespoon fresh chives (optional); Non-stick cooking spray

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Mornings with kids can feel like a marathon before the day even begins. This Sausage Egg Breakfast Casserole is my secret weapon for reclaiming weekend sanity. Make it ahead, pop it in the oven, and enjoy a hot, hearty meal with almost zero morning effort.

Why This Recipe Works

Make-Ahead Magic: Assemble the entire casserole the night before for a stress-free morning.
One-Pan Wonder: Cooks and serves from the same dish, drastically cutting cleanup time.
Crowd-Pleasing Flexibility: Easily adaptable for picky eaters or to use up fridge leftovers.
Freezer-Friendly: Bake, slice, and freeze portions for instant future breakfasts.

Ingredients

1 pound bulk breakfast sausage (mild or spicy, based on your family’s preference)
1 medium yellow onion, diced (about 1 cup)
1 medium red bell pepper, diced (about 1 cup)
8 large eggs
2 cups whole milk
1 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
1 teaspoon dry mustard powder
6 cups cubed day-old French or Italian bread (1-inch cubes)
2 cups shredded sharp cheddar cheese, divided
1 tablespoon chopped fresh chives or parsley for garnish (optional)
Non-stick cooking spray or butter for greasing

Equipment Needed

Large skillet (10 or 12-inch)
9×13 inch baking dish (glass or ceramic preferred)
Large mixing bowl
Whisk
Cutting board and chef’s knife
Measuring cups and spoons
Spatula or wooden spoon

Instructions

Step 1: Brown the Sausage and Veggies

Heat your large skillet over medium-high heat. No need to add oil—the sausage will provide plenty of fat. Add the 1 pound of bulk breakfast sausage, using your spatula to break it into small, crumbly pieces as it cooks. Cook for 5-7 minutes, stirring occasionally, until the sausage is no longer pink and is starting to brown. At this point, add the diced onion and red bell pepper directly to the skillet with the sausage. Reduce the heat to medium and cook, stirring frequently, for another 6-8 minutes. You’re looking for the onions to become translucent and the peppers to soften slightly. The goal is to cook out most of the moisture from the vegetables so your casserole doesn’t end up soggy. Once done, remove the skillet from the heat and let the mixture cool for about 10 minutes. This cooling step is crucial to prevent the hot sausage from accidentally cooking the eggs when you mix everything later.

Step 2: Prepare the Egg Custard Base

Step 3: Assemble the Casserole Layers
Take your 9×13 inch baking dish and grease it thoroughly with non-stick spray or butter. This is non-negotiable for easy serving later. Spread the 6 cups of cubed day-old bread evenly across the bottom of the dish. Day-old bread is key here; fresh bread will turn to mush. Scatter the cooled sausage and vegetable mixture over the bread layer. Next, sprinkle 1 1/2 cups of the shredded cheddar cheese evenly over the sausage. Reserve the remaining 1/2 cup for the top. Now, slowly and evenly pour the egg custard mixture you just whisked over the entire layered dish. Use a fork to gently press down on any bread cubes that are poking above the surface to ensure they get soaked. Let the assembled dish sit on the counter for 15 minutes. This resting time allows the bread to fully absorb the custard, which is the secret to a perfect texture—no dry bites.

Step 4: Bake to Golden Perfection

While the casserole rests, preheat your oven to 350°F (175°C). A proper preheat is essential for even cooking. After the 15-minute rest, sprinkle the reserved 1/2 cup of cheddar cheese over the top. Place the baking dish on the middle rack of your preheated oven. Bake for 45 to 55 minutes. Start checking at the 45-minute mark. The casserole is done when the center is firmly set (no liquid jiggle when you gently shake the dish) and the top is a beautiful, golden brown. A knife inserted into the center should come out clean. If the top is browning too quickly before the center is set, loosely tent the dish with aluminum foil. For the ultimate test of doneness, an instant-read thermometer inserted into the center should read 160°F.

Step 5: Rest, Serve, and Enjoy

Once baked, it’s tempting to dig right in, but patience pays off. Remove the casserole from the oven and place it on a wire rack or heatproof surface. Let it rest, uncovered, for a full 10 minutes before cutting. This resting period allows the custard to finish setting firmly, making it much easier to slice into neat squares that hold their shape. After resting, garnish with the optional chopped chives or parsley for a fresh pop of color. Use a sharp knife or a spatula to cut into 8 or 12 servings. It’s delicious served immediately, warm from the oven. If you have leftovers, they reheat beautifully. A quick tip for make-ahead mornings: if you assembled this the night before and baked it straight from the fridge, you will likely need to add 10-15 minutes to the baking time to account for the cold start.

Tips and Tricks

For the crispiest top layer, use a mix of cheeses. Try 1 1/2 cups cheddar and 1/2 cup grated Parmesan sprinkled on top—the Parmesan browns beautifully. If you’re sensitive to spice, swap the breakfast sausage for ground turkey or chicken sausage. To make this gluten-free, use your favorite gluten-free bread cubes (stale them in the oven first) and ensure your sausage is certified gluten-free. For a richer custard, substitute 1 cup of the milk with heavy cream. If you don’t have dry mustard powder, a teaspoon of Dijon mustard whisked into the eggs works in a pinch. To easily cube bread, stack a few slices and use a serrated knife in a sawing motion. For a complete hands-off morning, use a programmable oven to start preheating 30 minutes before you wake up.

Recipe Variations

Vegetarian Delight: Omit the sausage. Sauté 8 ounces of sliced mushrooms with the onions and peppers. Add a drained can of black beans or a cup of thawed frozen spinach (squeezed dry) to the veggie mix for protein and heft.
Southwest Fiesta: Use spicy chorizo or seasoned ground beef. Add a drained can of diced green chiles and a cup of frozen corn to the veggie sauté. Swap cheddar for pepper jack cheese and top with sliced avocado after baking.
Clean-out-the-Fridge: This recipe is incredibly forgiving. Substitute any cooked, crumbled meat (bacon, ham, leftover chicken). Use any diced veggies you have on hand—zucchini, broccoli florets, or cherry tomatoes work well. Almost any melty cheese will do.
Dairy-Free Version: Use your favorite unsweetened, unflavored non-dairy milk (oat or almond work well). For the cheese, either omit it or use a dairy-free shred that melts well. Ensure your sausage is dairy-free.

Frequently Asked Questions

Q: Can I really make this the night before?
A: Absolutely. Assemble the entire casserole up to the baking step, cover tightly with plastic wrap or a lid, and refrigerate overnight. In the morning, let it sit on the counter for 20-30 minutes while the oven preheats, then bake as directed, adding 10-15 minutes to the time.

Q: How do I store and reheat leftovers?
A: Cool leftovers completely, then store in an airtight container in the fridge for 3-4 days. Reheat individual portions in the microwave for 60-90 seconds or cover the whole dish with foil and warm in a 300°F oven for 15-20 minutes until heated through.

Q: My family doesn’t like soggy bread. Any advice?
A> The key is using day-old, sturdy bread and the 15-minute soak before baking. For extra insurance, you can spread the bread cubes on a baking sheet and toast them in a 300°F oven for 10 minutes to dry them out further before assembling.

Q: Can I freeze this breakfast casserole?
A> Yes, it freezes beautifully. Bake and cool the casserole completely. Cut into portions, wrap each tightly in plastic wrap and then foil, and freeze for up to 2 months. Thaw overnight in the fridge and reheat in the oven or microwave.

Summary

This Sausage Egg Breakfast Casserole is the ultimate tool for busy families. Prep ahead, minimize mess, and serve a customizable, satisfying meal that gives you back your precious weekend mornings.