Friends and family will oooh and ahhhh over this gourmet Crockpot Breakfast Casserole that includes bacon, Gruyere cheese, and a host of colorful veggies. Our well-tested method yields a perfectly cooked, mouthwatering casserole for brunch, Easter lunch, or dinner for a group!
6 Reasons You’ll Love This Recipe
I cannot impress this upon you enough: MAKE.THIS.CASSEROLE. Our team and families here at Thriving Home couldn’t get enough of it! Here’s why…
- Flavor and Color: With layers of hash browns, crispy bacon, gooey Gruyere cheese, Parmesan, roasted red peppers, kale, and more, it’s a sight to behold, smell, and devour!
- Easy to Make Ahead: Similar to our Spinach and Bacon Quiche, prep this ahead for your next holiday gathering or when you host guests. Store it in the fridge for up to 3 days or in the freezer (using our instructions below) for up to 3 months.
- BIG Batch: Serves 10-12 people and is great for feeding a crowd, like these other meals for large groups.
- Accurate Cook Time: Most recipes online have you overcook your casserole (overnight is waaay too long!). The correct cook time is actually only 4 hours on low according to multiple tests in our kitchens and according to America’s Test Kitchen’s cookbooks. So, this is perfect for a brunch, Easter lunch, or a breakfast-for-dinner option.
- Reheats Well: It’s delicious as leftovers! Our family ate on this casserole for days, and I was able to take some to our neighbors, too. Like I mentioned, it feeds an army!
- Gluten-free. If you’re trying to avoid gluten, this casserole does so by using hash browns instead of bread.
Tip: If you like the idea of this casserole but want one that bakes in the oven, try our 5-ingredient Hash Brown Breakfast Casserole.
Ingredients
Don’t be intimidated by this ingredient list. You can find everything you need at your local grocery store.
- Bacon – This is the #1 most important ingredient because….BACON. Here is how to make bacon in the oven. Be sure to chop it into small bite-sized pieces.
- Gruyere Cheese – This is perhaps the second most important ingredient, turning what could be a boring casserole into something gourmet! I bought one 6-ounce block and shredded it by hand. It just took a minute or so. Monterey Jack or Cheddar would work instead. P.S. Did you know you can freeze cheese?
- Shredded Parmesan cheese – Provides another layer of flavor.
- Roasted red peppers – Adds color and savoriness. Find a jar in the pickle aisle.
- Kale – Adds amazing color and nutrition. You can’t really taste it, though. You can substitute baby spinach instead.
- Yellow onion
- Fresh or frozen hash browns – Make sure they are thawed first.
- Milk – Your choice of what kind but I used 2%.
- Large eggs
- Salt and pepper, red pepper flakes, and garlic cloves – Good seasoning along the way is essential to this recipe.
Substitutes for Gruyere Cheese
Gruyere is a hard light yellow Swiss that’s known as a mild-tasting melting cheese. It adds savoriness without overshadowing the other ingredients.
If you don’t have it or can’t find it, no worries.
You can substitute your favorite shredded cheese. Cheddar cheese or Colby jack would work well.
Variations
Feel free to try some of these swaps and additions:
- Replace the kale with baby spinach or Swiss chard.
- Try a different kind of cheese in place of the Gruyere. Some ideas: Swiss, cheddar, or Monterey jack.
- Use diced ham or browned, crumbled breakfast sausage in place of the bacon.
- Add in diced bell peppers when sautéing the onions.
Pro Tips
After making this many times over the years, here are a few secrets to success:
- Spray the crock pot insert well with cooking spray to avoid sticking and help with clean-up.
- This was tested in a 6 quart slow cooker. Every slow cooker runs a little differently, so yours may be done a little sooner if it runs hot.
- The casserole is done when the center is completely set or 160°F internally. I usually poke a butter knife in the middle to make sure it’s cooked through.
- Water may accumulate on top because of the moist cooking environment. Just dab it off with a paper towel before serving.
- To make the casserole look even more appetizing, sprinkle freshly chopped herbs like parsley or chives over the top.
How Long Should I Cook a Breakfast Casserole in the Crockpot?
We know you want a slow cooker breakfast casserole that takes all night to cook and is waiting for you in the morning. But, I want to let you in on a not-so-fun secret: you’ll end up with an overcooked, burned breakfast casserole if you do.
Here’s the good news. We learned while testing recipe after recipe for From Freezer to Cooker that the perfect cook time for a crockpot breakfast casserole is exactly 4 hours on LOW. That means you can have it done just in time for a brunch or make it as a breakfast-for-dinner option.
This crockpot breakfast casserole also reheats well in the microwave in small portions, so don’t be afraid to cook it ahead of time and eat it later.
How to Prep It Ahead of Time
Reduce stress and free up yourself to enjoy your next gathering by preparing this big batch recipe ahead of time.
Refrigerator Method (up to 3 days ahead): Simply build the casserole in the slow cooker insert (do NOT cook), cover it with plastic wrap or foil, and store in the refrigerator for up to 3 days.
Freezer Method (up to 3 months ahead): Believe it or not, this recipe will work as a freezer meal.
To Freeze For Later: Follow Steps 1-3; let the veggie mixture cool. In a large bowl, whisk together the eggs, milk, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Pour the egg mixture into a gallon-sized freezer bag or container. Add in the veggies and bacon, hash browns, 1 cup of Gruyere cheese, and 1/4 cup of Parmesan cheese. Seal tightly, toss lightly to combine, and freeze. Add the remaining 1/2 cup of Gruyere and 1/4 cup of Parmesan to a small freezer bag or container and freeze along with the egg mixture.
To Prepare From Frozen: Thaw in the refrigerator. (Tip: Place the freezer bag in a dish to prevent leaks.) Spray the slow cooker with cooking spray. Transfer the egg mixture to the slow cooker and stir to make sure ingredients are combined and evenly distributed. Top with the remaining 1/4 cup of Parmesan and 1/2 cup of Gruyere. Follow Steps 6-7.
Side Dish Ideas
Here are side dish ideas that would go well with our Crockpot Breakfast Casserole.
FAQs
Leftover crockpot breakfast casserole can be stored in the refrigerator in an air-tight container for 3 to 5 days.
The casserole is done when the center is completely set or 160°F internally. I usually poke a butter knife in the middle to make sure it’s cooked through.
After testing recipes for our crockpot cookbook, From Freezer to Cooker, we learned that a hash brown breakfast casserole only takes 4 hours on LOW in the slow cooker. America’s Test Kitchen confirms this timing in their cookbooks, too.
Note: We learned from hundreds of tests, that every crock pot cooks a little differently. Just aware that it make take a little less or more time depending on your slow cooker.
Did you make this? Snap a photo and tag us on Instagram at @thrivinghome so we can see your creations and cheer you on!
Crockpot Breakfast Casserole with Bacon and Gruyere Cheese
Friends and family will oooh and ahhhh over this gourmet Crockpot Breakfast Casserole that includes bacon, Gruyere cheese, and a host of colorful veggies. Our well-tested method yields a perfectly cooked, mouthwatering casserole for brunch or breakfast-for-dinner.
Ingredients
- 1 pound (16 ounces) bacon, diced
- 1 medium yellow onion, diced (about 1 1/4 cups)
- Pinch of red pepper flakes
- 2 garlic cloves, minced
- 1 (12-ounce) jar roasted red peppers, thoroughly drained and diced (Sub: 1–2 diced red bell peppers, sautéed)
- 2 cups finely chopped kale (be sure to remove the tough stems) (Sub: spinach)
- Salt and ground black pepper, to taste
- Cooking spray
- 3 cups (about 15 ounces) refrigerated or frozen shredded hash browns, thawed (it’s important to thaw them first!)
- 1/2 cup shredded Parmesan cheese (sub: grated Parmesan cheese)
- 2 cups (a 6-ounce block) shredded Gruyere cheese (sub: Swiss cheese, Monterey Jack, or your favorite shredded cheese)
- 12 large eggs
- 1 cup milk (we used 2% milk, but it’s your choice)
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Instructions
Make It Now:
- Cook Bacon: Cook the bacon in a large skillet over medium heat until brown and crispy, about 8 minutes. Using a slotted spoon, transfer the bacon to a paper-toweled lined plate and set aside. Pour off extra grease, leaving about 2 tablespoons in the pan.
- Saute Veggies: Turn the heat up to medium-high and add the onions and red pepper flakes. Sauté until softened, about 3-4 minutes. Stir in the peppers, kale, and garlic and cook another 1-2 minutes, until the kale has wilted, seasoning lightly with salt and pepper while it cooks. Set aside. (Freezing instructions begin here.)
- Layer the Casserole: Spray a 6-quart slow cooker insert generously with cooking spray. Layer 1 1/2 cups of the hash browns, 1/2 of the bacon, half of the veggie mixture, 1/4 cup Parmesan, and 1 cup Gruyere, and then repeat with the remaining hash browns, bacon, veggies, and cheeses.
- Prep Wet Ingredients: In a large mixing bowl, whisk together eggs, milk, 1/4 teaspoon salt, and 1/4 teaspoon black pepper. Pour over the other ingredients in the slow cooker. (Note: The casserole can sit in the refrigerator for up to 3 days at this point.)
- Slow Cook: Cover and cook on Low for 4 hours, or until the center is set.
- Serve: Dab off any moisture from the top with a paper towel. Taste and season with more salt and pepper, as needed. Serve warm.
Freeze For Later: Follow Steps 1-3; let the veggie mixture cool. In a large bowl, whisk together the eggs, milk, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Pour the egg mixture into a gallon-sized freezer bag or container. Add in the veggies and bacon, hash browns, 1 cup of Gruyere cheese, and 1/4 cup of Parmesan cheese. Seal tightly, toss lightly to combine, and freeze. Add the remaining 1/2 cup of Gruyere and 1/4 cup of Parmesan to a small freezer bag or container and freeze along with the egg mixture.
Prepare From Frozen: Thaw in the refrigerator. (Tip: Place the freezer bag in a dish to prevent leaks.) Spray the slow cooker with cooking spray. Transfer the egg mixture to the slow cooker and stir to make sure ingredients are combined and evenly distributed. Top with the remaining 1/4 cup of Parmesan and 1/2 cup of Gruyere. Follow Steps 6-7.
Notes/Tips
- Trust us on the cook time so you don’t overcook it! Most slow cooker casserole recipes say to cook overnight, but the perfect timing is actually 4 hours on low.
- The casserole is done when the center is completely set or 160°F internally. I usually poke a butter knife in the middle to make sure it’s cooked through.
- Make Ahead: You can prepare the casserole, cover, and place it in the fridge for up to 3 days in advance.
- Gluten-Free Note: While this is a naturally gluten-free casserole, hash browns can sometimes be cross-contaminated with gluten during processing. So look for “gluten-free” on the package if that’s a concern.
- This was tested in a 6 quart slow cooker. Every slow cooker runs a little differently, so yours may take a little less time or take a little more time.
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