Easy Overnight Breakfast Casserole for the Holidays

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This make-ahead breakfast casserole is perfect for busy holiday mornings. Just layer hash browns, sausage, and cheese in your slow cooker, pour beaten eggs on top, and let it cook while you sleep. Wake up to a hot, hearty breakfast.

Clare Greco
Updated on Tue, 21 Jan 2025 13:27:32 GMT
A close-up view of a cheesy, baked breakfast casserole with layers of meat, eggs, and garnished with parsley. Pin it
A close-up view of a cheesy, baked breakfast casserole with layers of meat, eggs, and garnished with parsley. | recipesim.com

My overnight slow cooker breakfast has saved countless busy mornings in our house. I layer crispy hash browns spicy sausage and colorful peppers then pour over eggs and let the slow cooker work its magic while we sleep. The best part is waking up to the most incredible aroma and knowing a hot delicious breakfast is ready whenever we are.

Morning Made Easy

I started making this breakfast casserole during holiday seasons when the house was full of guests. Now it's become our weekend tradition. The beauty lies in its simplicity prep everything the night before and wake up to perfectly cooked layers of comfort food. The combination of crispy potatoes savory sausage and melty cheese never fails to bring smiles to sleepy faces.

What You'll Need

  • Sausage: One pound of your favorite breakfast sausage I sometimes use turkey for a lighter option
  • Hash Browns: A big bag of frozen ones they crisp up beautifully
  • Peppers: Red and green add such pretty color and sweet flavor
  • Onion: One yellow onion diced up nice and small
  • Cheese: Plenty of pepper jack gives it the perfect kick
  • Eggs: A full dozen makes it rich and filling
  • Milk: Just enough to make the eggs fluffy
  • Seasonings: Salt and pepper keep it simple
  • Extra Options: Sometimes I add green chiles or fresh cilantro
A close-up of a baked dish featuring a creamy mixture topped with crispy bacon and melted cheese. Pin it
A close-up of a baked dish featuring a creamy mixture topped with crispy bacon and melted cheese. | recipesim.com

Night Before Magic

Get Everything Ready
Brown your sausage chop those veggies and give your slow cooker a good spray
Build Your Layers
Start with hash browns then layer in sausage peppers onions and cheese three times
The Egg Bath
Whisk those eggs with milk and seasonings then pour it all over
Sweet Dreams
Set it on low and let it cook while you sleep
Morning Glory
Give it a few minutes to set then dig in

Make It Your Own

Some mornings I swap in crispy bacon or use tater tots instead of hash browns. My spice loving friends add extra green chiles while others prefer it mild. Fresh cilantro and pico de gallo on top take it in a Mexican direction. A bowl of fresh fruit on the side makes it complete.

Saving for Later

Leftovers taste amazing for days just pop them in the fridge. I often make extra to freeze in individual portions perfect for busy weekday mornings. Three months later it still tastes like it just came out of the slow cooker especially with a quick warm up.

My Kitchen Secrets

Don't skip spraying the slow cooker really well those eggs love to stick. Make sure your sausage is well drained and spread everything in even layers. Sometimes I run it under the broiler at the end for an extra crispy top just watch it closely.

Frequently Asked Questions

→ Can I prepare this the night before?

Yes, layer everything except the eggs in the slow cooker, cover and refrigerate overnight. Add the beaten egg mixture just before starting to cook in the morning.

→ Why do I need to use freshly shredded cheese?

Pre-shredded cheese contains anti-caking agents that can prevent proper melting. Fresh shredded cheese melts better and creates a creamier texture.

→ Can I use different types of cheese?

Yes, you can mix and match cheeses. Just make sure to use good melting cheeses like cheddar, monterey jack, or colby for best results.

→ Why shouldn't I lift the lid while cooking?

Lifting the lid releases heat and moisture, which can make the casserole watery and increase cooking time. Keep the lid on for best results.

→ Can I make this in the oven instead?

Yes, bake in a 9x13 dish at 350°F for about 45-60 minutes until eggs are set. Cover with foil if top browns too quickly.

Christmas Breakfast Casserole

Layer hash browns, sausage, and cheese in your slow cooker, then pour over eggs for an effortless holiday breakfast that cooks overnight.

Prep Time
10 Minutes
Cook Time
480 Minutes
Total Time
490 Minutes

Category: Morning Favorite

Difficulty: Easy

Cuisine: American

Yield: 10 Servings (1)

Dietary: Gluten-Free

Ingredients

01 12 large eggs.
02 1 cup milk or half & half cream.
03 2 pounds frozen hash brown potatoes.
04 1 pound bulk breakfast sausage, cooked.
05 ½ cup onions, diced.
06 ½ cup mixed red & green bell peppers, diced.
07 1½ cups cheddar cheese, freshly shredded.
08 1½ cups pepper jack cheese, freshly shredded.
09 1 teaspoon kosher salt.
10 ½ teaspoon black pepper.

Instructions

Step 01

Spray slow cooker with cooking spray.

Step 02

Mix cheddar and pepper jack cheeses in one bowl.

Step 03

Combine cooked sausage with diced peppers and onions in another bowl.

Step 04

In a large bowl, beat eggs well. Whisk in milk, salt, and pepper.

Step 05

Layer ingredients in slow cooker: Place ⅓ of hash browns, add ⅓ of sausage mixture, and top with 1 cup of cheese mixture. Repeat layers twice more, ending with cheese.

Step 06

Pour egg mixture evenly over all layers.

Step 07

Cover and cook on low for 8 hours.

Notes

  1. Use freshly shredded cheese for best melting.
  2. Don't open the lid during cooking.
  3. Can layer ingredients the night before, add eggs before cooking.
  4. Perfect for holiday mornings.

Tools You'll Need

  • Slow cooker.

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Eggs.
  • Dairy (cheese, milk).

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 465
  • Total Fat: 32 g
  • Total Carbohydrate: 28 g
  • Protein: 24 g