Name: Crockpot Breakfast Casserole
Prep time: 20 min
Cook time: 240 min
Total time: 260 min
Ingredients: 1 (1 pound) bag frozen hash browns Southern-style, (thawed and drained); 2 (9-ounce) packs breakfast sausage links (casings removed); 1 pound bacon; 1/4 cup green onions (thinly sliced); 12 large eggs (well beaten); 1 cup milk; 1 1/2 teaspoons Italian seasoning; 1 teaspoon dry mustard; 1/2 teaspoon garlic powder; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 2 cups cheddar cheese (shredded - divided); 1 cup Mozzarella (shredded); 2-3 tablespoons green onions. (thinly sliced)

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This Crockpot Breakfast Casserole is the cozy, set-it-and-forget-it breakfast every busy morning dreams about. It’s loaded with hash browns, sausage, bacon, cheese (two kinds!), and fluffy eggs — all slow-cooked into a warm, comforting, no-stress meal the whole family devours.

Why this recipe is so delicious: You get all the best breakfast flavors layered together — smoky bacon, savory sausage, creamy eggs, melty cheese, and perfectly tender potatoes — and your slow cooker handles every bit of the work. It’s hearty, hands-off, and perfect for holidays, brunches, or lazy weekends when you want something special with zero fuss. Pull up a chair — you’re going to want seconds of this one.

If you love hearty morning casseroles, you’ll also enjoy my Pioneer Woman Breakfast Casserole and Tater Tot Breakfast Casserole. For something similar-but-different to round out your brunch table, try my Hashbrown Casserole or classic Sour Cream Coffee Cake.

Pull up a chair — breakfast is about to get extra cozy.

✨ Before You Begin

✨ Thaw your hash browns fully. This helps the casserole cook evenly and prevents soggy spots.
✨ Grease your crock well. Nonstick spray (or a slow cooker liner) saves you from any sticking.
✨ Let the mozzarella chill. A quick 15 minutes in the freezer makes it much easier to grate.
✨ Brown your meats separately. Removing excess grease keeps the casserole fluffy, not heavy.
✨ Slow cooker times vary. Start checking early — every crockpot runs differently.

Ingredients You’ll Need For This Crockpot Breakfast Casserole

Hash browns come in all shapes and sizes. I prefer the shredded ones, but you can experiment with different kinds. You can even try the ones with frozen peppers for an extra kick! The only adjustment you might need to make is cooking slightly longer if the potato is really chunky! You can also use refrigerated hashbrowns.
Breakfast Sausage Links: You can use breakfast sausage packaged in a roll (like Jimmy Dean), instead of links, and skip the step of removing the casing!
Eggs: I use large eggs.
Milk: I like to use whole milk in this recipe but you can use a lower fat option.
Italian Seasoning: Add a great combo of flavor.
Dry Mustard: To add some depth of flavor, a bit of toastiness, and a slight amount of pungency.
Black Pepper: Adds a gentle spiciness, and a slightly woodsy and piney undertone.
Cheddar Cheese: Cheddar is delicious in this casserole. Colby Jack is a good substitute!
Mozzarella: You can buy the pre-grated kind, but it’s coated with cellulose (wood pulp!) I like to grate it myself. The easiest way to grate mozzarella is to let it sit in the freezer for about 15 minutes before you grate it, so it firms up enough that it doesn’t crumble in your grater!

🍳 The Breakfast Science

Why does this casserole stay so fluffy? The milk-and-egg custard gently cooks low and slow, creating a tender, almost soufflé-like texture you’ll never get in the oven. Dry mustard gives surprising depth — it’s a classic chef’s trick for enhancing egg dishes without adding noticeable “mustard” flavor.

⭐ Pro Tips

⭐ Freeze your mozzarella before grating. It firms up just enough to grate cleanly without turning gummy or sticking to the box grater.

⭐ Cook the meat completely. Any excess grease will make the casserole dense. Fully browning (and draining!) keeps the texture light and perfect.

⭐ Don’t lift the lid early. It releases too much heat and can make the center cook slower — trust the process!

⭐ Prep the night before. Assemble everything except the eggs, keep chilled, then whisk and pour the eggs in the morning before cooking.

How To Make Crockpot Breakfast Casserole

Brown the sausage, crisp the bacon, and whisk your eggs with the milk, seasonings, and most of the cheese. Grease the crock, spread the hash browns on the bottom, and layer on the sausage, bacon, and green onions.

Pour the egg mixture over the top and let the slow cooker work its magic. When the eggs are set, add the remaining cheese, let it melt, and serve warm with a sprinkle of green onions. Let the crockpot do its magic!

✦ Frequently Asked Questions

✦ Can I cook this on high instead of low?

Yes! You can cook this casserole on high for 2 ½ to 3 hours, but start checking early. Slow cookers vary, and some run hotter than others. The eggs should be fluffy, set in the center, and no longer glossy.

✦ Can I prep this the night before?

Absolutely. You can brown the sausage and bacon, grate the cheese, and whisk the egg mixture ahead of time. Keep everything refrigerated, then assemble and cook in the morning so the potatoes stay fresh and the eggs cook evenly.

✦ Can I make this casserole without hash browns?

Yes — it works beautifully with chopped cauliflower, broccoli, or 2 cups of cubed day-old bread. Just be sure your veggies are well-drained so excess moisture doesn’t make the casserole watery.

✦ What size crockpot works best?

A 6-quart slow cooker is ideal. If yours is smaller, simply cut the recipe in half and reduce the cook time slightly. The casserole should fill the crock no more than two-thirds full to ensure even cooking.

✦ How will I know when the casserole is done?

The eggs should be set, puffed, and no longer shiny in the center. If the center still jiggles or looks wet, continue cooking and check every 20 minutes until fully set.

Still have questions? Drop them in the comments — I love helping you cook with confidence! 💗

Storing + Reheating + Freezing + Make-Ahead Tips

Storing

Store leftovers in an airtight container in the fridge for 3–4 days.

Reheating

Warm individual servings in the microwave or reheat larger portions in a 350°F oven, covered with foil, for 15–20 minutes.

Freezing

Freeze in individual portions for up to 2 months. Thaw overnight and reheat gently so the eggs stay tender.

Make-Ahead

You can brown meats, grate cheese, and prep the egg mixture the night before. In the morning, layer and cook fresh.

What to Serve With Crockpot Breakfast Casserole

This casserole is a wonderful stand-alone dish, but it’s also fabulous as the centerpiece of a full brunch spread — especially during the holidays when a true set-it-and-forget-it recipe feels like a gift!

More Breakfast Love

Easy Breakfast Casserole – A classic, crowd-pleasing bake loaded with eggs, cheese, and hearty breakfast flavors.
Spinach Mushroom Quiche – Light, savory, and silky smooth with plenty of fresh spinach and tender mushrooms.
McGriddle Bites – All the sweet-and-savory McGriddle magic packed into bite-sized, freezer-friendly breakfast bites.
Biscuits and Gravy Casserole – Southern comfort in casserole form — fluffy biscuits, creamy sausage gravy, and pure cozy goodness.
Croissant Breakfast Casserole – Buttery croissants baked with eggs, cheese, and breakfast sausage for a rich, irresistible brunch.
Bisquick Quiche – The easiest “impossible” quiche — no crust, no fuss, just fluffy, cheesy, oven-ready perfection.

Tried This Recipe?

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Thanks for stopping by my kitchen today — happy cooking, friends! 💗 Kathleen