This Slow Cooker Breakfast Casserole is a warm and tasty way to start your day! Packed with eggs, cheese, and your favorite breakfast meats, it’s super simple to make.
You just mix everything in the slow cooker and let it work its magic. Perfect for busy mornings or when you have guests—everyone will love it as much as I do!
Key Ingredients & Substitutions
Breakfast Sausage: This adds a hearty flavor to the casserole. If you prefer a lighter option, consider using turkey sausage or you can make it vegetarian by substituting with sautéed mushrooms or veggie sausage.
Eggs: Eggs are the base of this casserole. For a dairy-free version, use flax eggs or a commercial egg substitute. You can also add a splash of plant-based milk if needed.
Cheddar Cheese: Cheddar is a classic choice for breakfast casseroles. If you want to try other flavors, Monterey Jack, Pepper Jack (for a kick), or even a vegan cheese can be great alternatives.
Hash Browns: Frozen hash browns are convenient but you can use freshly grated potatoes if you prefer. Just soak them in water to remove excess starch and pat dry before using.
Bell Pepper and Onion: Feel free to mix it up! You can use green bell peppers, zucchini, or even spinach for a different flavor. Customize based on what’s in your fridge or your family’s favorites!
How Do I Ensure My Casserole Is Cooked Perfectly?
Cooking the casserole in the slow cooker is a great way to let the flavors meld together. To ensure perfect results:
- Cook on low for 6-7 hours or high for 3-4 hours. The key is to check if the eggs are set in the middle before serving.
- Let it sit for 5 minutes after cooking to firm up slightly. This helps with cutting clean slices!
- Add cheese in the final minutes of cooking to keep it melty and delicious.
Don’t rush it; the slow cooker is forgiving, allowing the dish to come together beautifully!

Slow Cooker Breakfast Casserole
Ingredients You’ll Need:
For the Casserole:
- 1 lb breakfast sausage
- 8 large eggs
- 1 cup milk
- 2 cups shredded cheddar cheese, divided
- 1 cup diced red bell pepper
- 1/2 cup chopped onion
- 2 cups frozen hash browns, thawed
- 1 tsp salt
- 1/2 tsp black pepper
- 1/2 tsp garlic powder
- Fresh parsley or cilantro, chopped (for garnish)
How Much Time Will You Need?
This delicious breakfast casserole will take about 15 minutes to prepare and will need to cook for 6-7 hours on low or 3-4 hours on high in the slow cooker. It’s an easy and hearty dish that’s perfect for breakfast gatherings or busy weekday mornings!
Step-by-Step Instructions:
1. Cook the Sausage:
Start by browning the breakfast sausage in a skillet over medium heat. Cook it until it’s browned and fully cooked. Once done, drain any excess grease and set the sausage aside.
2. Prepare the Egg Mixture:
In a large bowl, whisk together the eggs, milk, salt, black pepper, and garlic powder until everything is well combined. This mixture will give your casserole its fluffy texture!
3. Assemble the Casserole:
Lightly grease the inside of your slow cooker with cooking spray or a little oil to prevent sticking. Layer the thawed hash browns on the bottom evenly. Then, sprinkle the cooked sausage, diced red bell pepper, and chopped onion over the hash browns.
4. Add the Egg Mixture:
Pour the egg mixture evenly over the layers in the slow cooker. Make sure it’s distributed well so every bite is flavorful.
5. Top with Cheese:
Sprinkle 1 ½ cups of the shredded cheddar cheese on top of everything for that cheesy goodness!
6. Cook the Casserole:
Cover the slow cooker and cook on low for 6-7 hours or on high for 3-4 hours. You’ll know it’s done when the egg mixture is set and the top has a slightly golden appearance.
7. Finish with More Cheese:
In the last 10-15 minutes of cooking, sprinkle the remaining ½ cup of cheddar cheese on top and cover again until the cheese is melted and bubbly.
8. Let It Rest and Serve:
Turn off the slow cooker and let the casserole sit for about 5 minutes before serving. This little rest allows it to firm up slightly for easier serving.
9. Garnish:
Before serving, feel free to sprinkle fresh chopped parsley or cilantro on top for a lovely touch of color and freshness!
10. Enjoy!
Serve warm and enjoy your hearty Slow Cooker Breakfast Casserole—perfect for start your day with a big smile!
Can I Use a Different Type of Sausage?
Absolutely! You can use turkey sausage, chicken sausage, or even a plant-based sausage for a healthier or vegetarian option. Just make sure it’s fully cooked before adding it to the slow cooker.
Can I Make This Casserole Dairy-Free?
Yes! Substitute the milk with a non-dairy alternative like almond milk or oat milk. You can also use dairy-free cheese to maintain that cheesy texture!
How Do I Store Leftovers?
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, simply warm it in the microwave or oven until heated through. You might want to add a splash of milk when reheating to keep it moist.
Can I Add More Veggies?
Definitely! Feel free to get creative by adding in veggies like spinach, zucchini, or mushrooms. Just make sure to chop them finely so they cook through properly in the slow cooker.
