I wake up to a hearty, cheesy breakfast casserole packed with hash browns, sausage, eggs, and savory seasonings that feels like it was made for hungry mornings. This slow cooker favorite always disappears fast, and the secret is in the overnight magic.

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I’m obsessed with this slow cooker breakfast casserole because it tastes like the best diner plate got packed into one big, messy bite. I love the way hash browns turn tender underneath, while breakfast sausage brings that salty, savory kick I want first thing in the morning.

And the edges? My favorite part.

A little crisp, a little rich, totally worth sneaking an extra scoop. I like that it feels hearty without being fussy, the kind of breakfast I can serve half-asleep and still get excited about.

But honestly, I’d eat it for dinner too. No shame at all, ever.

Ingredients

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Hash browns make it hearty, cozy, and a little crispy around the edges.
Breakfast sausage brings the salty, savory bite everyone digs into first.
Sharp cheddar melts through everything, so each scoop feels extra comforting.
Eggs hold it all together and make it feel like real breakfast.
Whole milk keeps the texture soft, creamy, and not dry or rubbery.
Dry mustard adds a tiny tang that keeps the cheese from tasting flat.
Onion gives sweet, mellow flavor without taking over the whole casserole.
Garlic makes it smell amazing, basically like brunch is already happening.
Salt and pepper keep the flavors awake, not bland or sleepy.
Plus, greasing the slow cooker means you’ll actually enjoy cleanup later.

Ingredient Quantities

2 pounds frozen shredded hash browns, thawed

1 pound breakfast sausage, cooked and drained

2 cups shredded sharp cheddar cheese

8 large eggs

2 cups whole milk

1 teaspoon dry mustard

1 small yellow onion, finely chopped

2 cloves garlic, minced

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper

Nonstick cooking spray or 1 tablespoon butter for the slow cooker

How to Make this

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1. Spray the slow cooker with nonstick cooking spray or rub with 1 tablespoon butter to coat the insert.

2. Squeeze excess moisture from the thawed shredded hash browns if very wet, then spread half of them in an even layer on the bottom of the slow cooker.

3. Sprinkle half of the cooked and drained breakfast sausage, half of the chopped onion, half of the minced garlic, and half of the shredded cheddar evenly over the hash browns.

4. Repeat with the remaining hash browns, sausage, onion, garlic, and cheddar to form a second layer.

5. In a large bowl whisk together 8 large eggs, 2 cups whole milk, 1 teaspoon dry mustard, 1 teaspoon kosher salt, and 1/2 teaspoon freshly ground black pepper until well combined.

6. Pour the egg mixture slowly and evenly over the layered ingredients in the slow cooker so it soaks through the layers.

7. Cover and cook on low for 6 to 8 hours for an overnight style bake, or on high for 3 to 4 hours, until the center is set and a knife inserted near the middle comes out clean.

8. Turn the slow cooker off and let the casserole rest, uncovered, for 10 to 15 minutes to firm up before slicing.

9. Serve warm, scooping portions with a spatula. Leftovers refrigerate in an airtight container for up to 4 days.

Equipment Needed

1. Slow cooker (6 to 7 quart)

2. Large skillet for browning and draining the breakfast sausage

3. Large mixing bowl

4. Whisk

5. Measuring cups and spoons

6. Chef knife

7. Cutting board

8. Spatula or heatproof serving spoon for scooping

9. Paper towels or a fine-mesh strainer for draining excess moisture

FAQ

Can I use fresh shredded potatoes instead of frozen? Yes. Use about 2 pounds of peeled and shredded potatoes, squeeze out excess moisture, and proceed the same way.

How long should I cook it in the slow cooker? Cook on low for 4 to 5 hours or on high for 2 to 3 hours, until eggs are set and the center is cooked through.

Can I make this ahead and refrigerate or freeze? For make ahead, assemble and refrigerate up to 24 hours before cooking. To freeze, assemble in a freezer safe container and freeze up to 2 months; thaw overnight in the fridge before cooking.

How do I prevent the casserole from sticking? Generously spray the slow cooker with nonstick cooking spray or rub with butter. Lining with foil or a slow cooker liner also works for easy removal.

Can I substitute milk or change the sausage? Yes. Use half and half for a richer texture or a lower fat milk if preferred. Swap breakfast sausage for cooked bacon, ham, or a plant based sausage to suit diet preferences.

How can I tell when the casserole is done? The edges should be set and slightly pulled from the sides, and a knife inserted in the center should come out mostly clean with only a few moist crumbs.

Slow Cooker Breakfast Casserole Recipe Substitutions and Variations

Frozen shredded hash browns: use 2 pounds diced Yukon Gold or red potatoes, parboiled and cooled; or 2 pounds frozen cubed potatoes, thawed.
Breakfast sausage: substitute 1 pound cooked turkey sausage, crumbled Italian sausage, or 1 pound diced ham or Canadian bacon.
Sharp cheddar: swap 2 cups shredded Monterey Jack, Colby, or Gruyere for a milder, melty option; or use Pepper Jack for a bit of heat.
Whole milk: replace 2 cups with 1 cup half and half plus 1 cup water for extra richness, or use 2 cups unsweetened almond milk or evaporated milk thinned to taste.

Pro Tips

1. Squeeze extra moisture from the thawed hash browns with a clean kitchen towel or several layers of paper towel before layering. Drier potatoes mean a firmer casserole and less watery cooking liquid.

2. Brown and season the sausage well ahead of time. Crispy, well rendered sausage adds texture and deeper flavor than simply cooked through. Drain off most of the fat so the casserole does not become greasy.

3. Press each layer gently with the back of a spatula so the eggs can seep in evenly. If you want a slightly crisp top, transfer the finished casserole to a rimmed baking sheet and bake in a hot oven for 6 to 10 minutes until the surface is lightly browned.

4. Let the casserole rest uncovered for at least 10 minutes before slicing to firm up. For make ahead, cool completely, refrigerate overnight, then reheat covered at 350 F until warmed through to preserve texture and flavor.

Slow Cooker Breakfast Casserole Recipe

Recipe by Sarah level

0.0 from 0 votes

Servings

servings

Calories

499

kcal

Equipment: 1. Slow cooker (6 to 7 quart)