This post may contain affiliate links. Please read our disclosure policy.
This slow cooker egg casserole is the perfect make-ahead meal for busy mornings or a cozy weekend brunch. It’s easy to customize with your favorite add-ins, making it a warm and hearty dish for any gathering.
Recipe Overview: Slow Cooker Egg Casserole
- Ready In: 6 hours, 15 minutes (depending on slow cooker temperature)
- Serves: 8
- Calories: 388 kcal/serving (approximately)
- Main Ingredients: Eggs, sausage, peppers, onions, potatoes, cheese
- Dietary Notes: Gluten-free
- Why You’ll Love It: This slow cooker breakfast casserole is the perfect make-ahead meal. Just prep it the night before, and wake up to a warm, hearty breakfast that's already done. It's also easy to customize with your favorite veggies, meats, and cheeses, making it a flexible recipe that works for busy mornings, meal prep, or feeding a crowd.
SUMMARIZE & SAVE THIS RECIPE ON
This meal is the perfect make-ahead recipe when you need something ready to go in the morning. Just prep everything the night before, set it to cook, and wake up to breakfast already taken care of.
Enjoy this with brown sugar and pepper bacon, fluffy sourdough pancakes, and coffee with delicious vanilla and brown sugar creamer.
If you have an abundance of eggs, check out my fluffy scrambled eggs recipe and Instant Pot boiled eggs.
Jump to:
Why You’ll Love This Recipe
Easy: Make this casserole with simple ingredients and prep the night before for an effortless morning meal.
Crowd-Friendly: Perfect for brunches, holiday mornings, or feeding a house full of family and friends.
Customizable: This is a great base recipe that can be made with any veggies, meats, or different cheeses your family loves.
Kid-Approved: Made with everyday ingredients and familiar flavors, this recipe is a hit with even the pickiest of eaters.
Meal Prep: Prepare it in advance for a homemade breakfast that’s ready to go for the rest of the week. This is a great recipe for a Sunday reset routine.
Key Ingredients
Eggs: Eggs make the base of the casserole and give it a soft, fluffy texture. You can also use freeze-dried eggs for this recipe.
Sausage: Ground breakfast sausage adds delicious flavor and makes the dish hearty and satisfying without having to add extra spices (unless you want to!).
Veggies: I used onions, green peppers, and potatoes. But you can use your favorites or any veggies you have on hand.
Cheese: I used Parmesan, but feel free to swap another cheese you enjoy, such as cheddar or mozzarella.
Milk: I used whole milk, but reduced-fat milk will also work.
Get the full list of ingredients and measurements on the printable recipe card below.
Variations
Veggie Lovers: Load it up with extra veggies like spinach, mushrooms, or zucchini for a delicious, veggie-packed breakfast.
Meat Lovers: Add cooked home-cured pepper bacon, ham, or extra sausage for a protein-filled version.
Cheesy: Mix in extra cheese like cheddar, mozzarella, or Swiss for an extra melty casserole.
Southwest: Add black beans, peppers, corn, and a sprinkle of taco seasoning. Before serving, top with lacto-fermented salsa or avocado.
Hashbrown: Swap the diced potatoes for store-bought hashbrowns for an easy, classic meal. I really like Azure Standard’s southern hashbrowns.
How To Make a Slow Cooker Egg Casserole
Note: My slow cooker uses a regular baking dish, so the images show a casserole dish. Use your regular slow cooker insert for this recipe.
Step 1: In a large skillet, brown the ground breakfast sausage over medium-high heat.
Season with salt and pepper to taste. Drain the excess fat if necessary.
Step 2: Toss in the onions, green peppers, and potatoes. Cook for about 5 minutes, until the onions are soft and translucent.
Transfer the sausage and veggie mixture to the slow cooker insert and set aside.
Step 3: In a large mixing bowl, whisk together the eggs and milk until thoroughly combined. Season with salt and pepper to taste.
Step 4: Pour the egg mixture into the slow cooker with the sausage and veggies. Add the Parmesan cheese, then stir everything together gently to combine.
Step 5: Cover and cook on Low for 7-8 hours or High for about 4 hours, until the center is set and a knife inserted in the middle comes out clean.
Every slow cooker heats a little differently. Mine is usually done on Low in about 4 hours, so start checking around then.
Tips for Success
- Try making this recipe during the day the first time to gauge your slow cooker's timing. Mine cooks in about 4 hours, but some take up to 8. Then, you'll know how to adjust for overnight.
- Many sausage brands are seasoned well enough that you don't need to add anything else, but you can always include your favorite herbs and spices if you'd like.
- This recipe is great for meal prepping. Just reheat portions throughout the week for a quick and easy breakfast.
- Swap or add ingredients based on what your family likes best.
Serving Suggestions
Sourdough: A slice of homemade sourdough toast is perfect alongside this casserole.
Fruit: Fresh fruit like berries, melon, or citrus adds a delicious balance to the hearty breakfast dish.
Brunch Tables: This casserole is perfect for brunch. Serve it with sourdough cinnamon rolls, pancakes, fresh fruit, and coffee for an easy, delicious spread.
Burritos: Scoop some warm casserole into a sourdough tortilla for a quick and flavorful breakfast burrito.
Egg Bowls: Layer in a bowl with your favorite toppings like fresh greens, salsa, shredded cheese, or even my easy sauerkraut recipe.
Storing
- After cooling, store leftovers in an airtight container and keep in the fridge for up to 4 days.
- Reheat individual portions in the microwave or warm the whole dish in the oven until heated through.
Slow Cooker Egg Casserole FAQs
Yes, you can cook this casserole overnight! Set your slow cooker to low and let it cook for about 6-8 hours so it’s ready when you wake up.
Yes, frozen hash browns work great in this recipe. There’s no need to thaw first. Just stir them in from frozen. If you prefer crispier edges, you can lightly brown them in a skillet before adding them to the crockpot.
Yes, you can easily make this casserole vegetarian. Just skip the sausage or replace it with a plant-based alternative. Load it up with extra veggies (I like lacto-fermented peppers and fermented red onions) or add home-canned pinto beans for plenty of flavor and heartiness without the meat.
Yes, you can double the recipe if you’re feeding a large gathering. Just make sure your slow cooker is large enough to handle the extra amount.
You may need to add extra cooking time and check for doneness toward the end to ensure the eggs are done in the center. If it’s taking a long time, you can pop it in the oven at 350° F for a few minutes before serving.
More Breakfast Recipes
If you tried this Slow Cooker Egg Casserole recipe or any other recipe on my blog, please leave a 🌟 star rating and let me know how it went in the 📝 comments below. Thanks, y’all!
Slow Cooker Egg Casserole
Equipment
Ingredients
- 1 pound ground breakfast sausage
- 1/2 onion, diced
- 1 green bell pepper, diced
- 2 russet potatoes, diced
- 12 whole eggs
- 1/2 cup whole milk
- 1 cup parmesan cheese, shredded
- salt and pepper to taste
Instructions
- Cook the Sausage. In a large skillet, brown the ground breakfast sausage over medium-high heat. Season with salt and pepper to taste. Drain the excess fat if necessary.1 pound ground breakfast sausage
- Add the Veggies. Toss in the onions, green peppers, and potatoes. Cook for about 5 minutes, until the onions are soft and translucent. Transfer the sausage and veggie mixture to the slow cooker insert and set aside.1/2 onion, 1 green bell pepper, 2 russet potatoes
- Scramble the Eggs. In a large mixing bowl, whisk together the eggs and milk until thoroughly combined. Season with salt and pepper to taste.12 whole eggs, 1/2 cup whole milk
- Combine Everything. Pour the egg mixture into the slow cooker with the sausage and veggies. Add the Parmesan cheese, then stir everything together gently to combine.1 cup parmesan cheese
- Cook. Cover and cook on Low for 7-8 hours or High for about 4 hours, until the center is set and a knife inserted in the middle comes out clean. Every slow cooker heats a little differently. Mine is usually done on Low in about 4 hours, so start checking around then.
Notes
- Try making this recipe during the day the first time to gauge your slow cooker's timing. Mine cooks in about 4 hours, but some take up to 8. Then, you'll know how to adjust for overnight.
- Many sausage brands are seasoned well enough that you don't need to add anything else, but you can always include your favorite herbs and spices if you'd like.
- This recipe is great for meal prepping. Just reheat portions throughout the week for a quick and easy breakfast.
- Swap or add ingredients based on what your family likes best.
Nutrition
Nutrition information is auto-calculated and may not reflect your final product. Please verify independently if needed.
This is the easiest breakfast recipe. I usually toss in any leftover veggies I have in the fridge.