Overnight Slow Cooker Breakfast Casserole

Start your day with a warm, hearty meal that’s both effortless and delicious. This Overnight Slow Cooker Breakfast Casserole is the ultimate make-ahead breakfast that cooks itself while you sleep. Packed with savory ground turkey sausage, tender potatoes, colorful bell peppers, and gooey cheddar cheese, it’s a crowd-pleaser perfect for busy mornings, weekend brunches, or holiday gatherings. The beauty? You layer it all the night before, set your slow cooker, and wake up to a perfectly cooked, comforting casserole without any morning rush. Whether you’re feeding a family or prepping meals for the week, this recipe offers convenience, flavor, and wholesome ingredients in one satisfying dish.

Top Reasons to Make Overnight Slow Cooker Breakfast Casserole

• Effortless Morning Meal: Prep the night before, then just wake up and enjoy a hot breakfast.
• Feeds a Crowd: Generous portions that serve multiple people, perfect for family or guests.
• Balanced Flavors: The combination of savory sausage, sweet bell peppers, and sharp cheddar hits all the right notes.
• Hands-Off Cooking: Let the slow cooker do all the work while you sleep or go about your day.
• Customizable: Easily swap veggies or cheese to fit your taste preferences.
• Nutritious and Filling: High in protein and vegetables, it’s a wholesome way to start your day.

What You’ll Gather

• 2 pounds frozen potatoes, diced or shredded
• 1 pound ground turkey sausage, cooked into small pieces
• 1/2 cup red bell pepper, diced
• 1/2 cup orange bell pepper, diced
• 1 cup yellow onion, diced
• 1 1/2 cups low-fat cheddar cheese, shredded
• 12 large eggs
• 3/4 cup skim milk
• 1 teaspoon kosher salt
• 1/2 teaspoon ground black pepper
• 1 tablespoon Dijon mustard

Tools of the Trade

• Slow Cooker (6-quart or larger) – Essential for the overnight cooking process.
• Large Mixing Bowl – For whisking eggs and combining ingredients.
• Non-stick Skillet – To cook the ground turkey sausage evenly.
• Measuring Cups and Spoons – To ensure accurate ingredient portions.
• Rubber Spatula – Handy for mixing the casserole without scratching your slow cooker insert.
• Whisk – For beating eggs and milk together smoothly.

How to Prepare Overnight Slow Cooker Breakfast Casserole

Step 1: Cook the Ground Turkey Sausage

In a non-stick skillet over medium heat, cook the ground turkey sausage until browned and cooked through, breaking it into small pieces as it cooks. This will infuse the casserole with rich, savory flavor and add protein.

Step 2: Layer Your Ingredients in the Slow Cooker

Spray the inside of your slow cooker with non-stick cooking spray to prevent sticking. Start by spreading the frozen diced or shredded potatoes evenly at the bottom. Next, sprinkle the cooked turkey sausage over the potatoes. Add the diced red and orange bell peppers as well as the yellow onion, distributing them evenly. Finally, top the veggies and meat with the shredded low-fat cheddar cheese.

Step 3: Whisk the Egg Mixture

In a large mixing bowl, whisk together the 12 eggs, skim milk, kosher salt, ground black pepper, and Dijon mustard until well combined and slightly frothy. This mixture will bind the casserole together and add a creamy texture.

Step 4: Pour Egg Mixture Over Layers

Slowly pour the egg mixture over the layered ingredients in the slow cooker, making sure it seeps down to cover everything. This ensures every bite is flavorful and well-coated.

Step 5: Set and Forget

Cover the slow cooker with its lid and set it to cook on low for 7-8 hours overnight. The slow cooking allows the casserole to set perfectly without overcooking, resulting in a tender and fluffy breakfast.

Step 6: Serve and Enjoy

In the morning, lift the lid, and your Overnight Slow Cooker Breakfast Casserole will be hot and ready. Use a spatula to scoop out portions and serve immediately. Pair with fresh fruit or a light salad for a complete meal.

How to Make It Lighter

• Use egg whites or a combination of whole eggs and egg whites to reduce cholesterol.
• Swap the cheddar cheese for a reduced-fat or part-skim version.
• Incorporate additional vegetables like spinach or mushrooms to increase fiber and nutrients.
• Replace the ground turkey sausage with lean turkey breast or chicken sausage for fewer calories.
• Use unsweetened almond milk or another plant-based milk instead of skim milk for a dairy-free option.

Frequent Missteps to Avoid

• Overcooking: Leaving the casserole on high heat can make it dry or rubbery. Stick to the low setting overnight.
• Skipping the Cooking Spray: This can cause the casserole to stick to the slow cooker and make serving difficult.
• Using Fresh Potatoes: Fresh potatoes may not cook evenly overnight. Frozen diced or shredded potatoes work best for consistent texture.
• Underseasoning: Make sure to add enough salt and pepper to enhance the flavors throughout the casserole.

Save for Later: Storage Tips

After enjoying your casserole, store any leftovers in an airtight container in the refrigerator for up to 4 days. To reheat, microwave individual portions until warmed through or reheat in a 350°F oven covered with foil for 15-20 minutes. You can also freeze the casserole in portions for up to 2 months. Thaw overnight in the fridge before reheating. This makes it easy to plan ahead for busy mornings.

Handy Q&A

Can I use a different type of sausage?

Absolutely! Feel free to substitute the ground turkey sausage with chicken sausage, beef sausage, or a vegetarian sausage alternative. Just make sure it’s cooked fully before layering in the casserole.

Can I add other vegetables to the casserole?

Yes, you can customize your casserole by adding veggies like spinach, mushrooms, or zucchini. Just dice them small and distribute evenly in the layers for added nutrition.

What if I don’t have a slow cooker?

If you don’t own a slow cooker, you can bake this casserole in a 9×13-inch baking dish at 350°F for about 45-55 minutes or until the eggs are set and the top is golden brown.

How do I know when the casserole is done?

The casserole is ready when the eggs are fully set and no longer runny. You can insert a toothpick or knife into the center; it should come out clean. The edges may be slightly golden and crispy.

Healthy-ish Favorites

• Cowboy Casserole – A hearty, flavorful dish packed with protein and veggies.
• Vegetarian Overnight Breakfast Strata – A meat-free alternative that’s just as satisfying and easy to prepare.

The Takeaway

This Overnight Slow Cooker Breakfast Casserole is a game-changer for anyone who wants a delicious, wholesome breakfast without the morning hassle. With simple ingredients and minimal prep, you can enjoy a flavorful casserole that’s ready when you wake up. It’s perfect for families, meal prep enthusiasts, and anyone craving a warm, comforting start to the day. Give it a try, and you might just find your new favorite breakfast tradition.

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