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Best Breakfast Casserole

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This Breakfast Casserole made with brioche bread is a twist on my Classic Breakfast Casserole, but much more decadent and perfect for a holiday morning crowd. Make ahead the night before and breakfast will be a breeze. Make holiday mornings more special and pair this Breakfast Casserole with Homemade Cinnamon Rolls and Crockpot Hot Chocolate.

breakfast casserole in oval white dish

Hello Easy Holiday Breakfast

I have fallen in love with all-in-one breakfast casseroles! Not only are they super simple to throw together, they are delicious and feed a crowd. Whether you’re making a special treat for the holidays, a potluck, or just want a hearty breakfast with all the good stuff…this casserole checks all the boxes!

slice of breakfast casserole

How to Make Breakfast Casserole

Making this Breakfast Casserole is super simple, but does require a little planning ahead. For full recipe details, including ingredients and measurements, see the printable recipe card down below. Here is what to expect and the time frame you’ll want to plan for when making this recipe:

2 days before you want to cook your casserole

Cube up 6 cups of brioche bread or buns and place on large cookie sheet in open air to dry out.

The night before you want to cook your casserole

Brown Sausage + Onion

Brown diced onion and sausage in a skillet over medium/high heat until sausage has some crispy pieces and onion is almost caramelized. This goes quicker if you break into small pieces as you cook. 

Feel free to add any vegetables or other meat you’d like (mushrooms, spinach, peppers, ham, bacon, etc.).

Prep Baking Dish + Add Cheese & Dried Bread Cubes to Dish

Prepare a 9×13 baking dish with butter or non-stick spray. Place crusty bread cubes in baking dish and sprinkle with 1 cup of the cheese.

breakfast casserole ingredients

Add Sausage/Onion Mixture to the Casserole Dish

Add sausage/onion mixture evenly to casserole dish.

Combine Remaining Ingredients Together (Minus the Cheese) + Pour Over Casserole

Combine eggs, half & half, dry mustard, onion powder, salt and pepper and pour evenly over other ingredients in dish. Top with remaining 1 cup of cheese.

Refrigerate Overnight

Cover with plastic wrap and refrigerate overnight. 

breakfast casserole uncooked

The Morning of

Preheat Oven + Allow Casserole to Sit at Room Temperature

Preheat oven. Pull casserole dish out of refrigerator and let sit for 30-40 minutes on counter. 

Bake

Remove plastic wrap and bake for 1 hour or until eggs are set. Serve hot and enjoy!

breakfast casserole on white plate with fork

Storing Leftovers

Breakfast Casserole leftovers should be covered and stored in an airtight container in the refrigerator for up to 4 days. 

To Reheat. Simply pop a square into the microwave for 30 seconds to 1 minute or until heated through

Freezing Instructions

If you REALLY want to make this breakfast casserole recipe ahead of time, you can freeze it!

To Freeze. Simply follow the instructions all the way through. Cool completely, then cover with foil and store in a freezer bag for up to 2 months.

To Reheat. Thaw in the refrigerator overnight. Then bake at 350 degrees until heated through. This takes about 20 minutes.

breakfast casserole in oval white dish with spoon

More Hearty Breakfast Recipes!

Be sure to save this recipe to refer back to later by printing, bookmarking, or sharing! Have a great week friends! 🙂

Best Breakfast Casserole

This Breakfast Casserole made with brioche bread is a twist on my Classic Breakfast Casserole, but much more decadent and perfect for a holiday morning crowd. Make ahead the night before and breakfast will be a breeze.
servings 6
Prep Time 20 mins
Cook Time 1 hr

Ingredients

  • 6 cups brioche bread or buns cubed and air dried the night before
  • 1 lb ground breakfast sausage
  • 1 cup onion finely diced
  • 10 eggs beaten
  • 3 cups half & half
  • 2 cups sharp cheddar cheese shredded
  • 2 tsp dry mustard
  • 1/2 tsp onion powder
  • 1 salt & pepper to taste

Instructions

2 days before you want to cook your casserole

  • Cube up 6 cups of brioche bread or buns and place on large cookie sheet in open air to dry out.
    cubed bread in casserole dish

the night before you want to cook your casserole

  • Brown diced onion and sausage in a skillet over medium/high heat until sausage has some crispy pieces and onion is almost caramelized. This goes quicker if you break into small pieces as you cook.
    sauteing sausage and onion
  • Prepare a 9×13 baking dish with butter or non-stick spray.
  • Place crusty bread cubes in baking dish and sprinkle with 1 cup of the cheese.
    cubed bread with shredded cheese on top
  • Add sausage/onion mixture evenly to casserole dish.
    breakfast casserole ingredients
  • Combine the remaining ingredients (except the last cup of cheese) and pour evenly over other ingredients in dish.
    pouring egg into breakfast casserole
  • Top with remaining cheese.
    uncooked breakfast casserole
  • Cover with plastic wrap and refrigerate overnight.

the morning of

  • Preheat oven to 325° F.
  • Pull casserole dish out of refrigerator and let sit for 30-40 minutes on counter.
    breakfast casserole with plastic wrap
  • Remove plastic wrap and bake for 1 hour or until eggs are set.
  • Serve hot and enjoy!
    slice of breakfast casserole

Video

Notes

Feel free to add any vegetables or other meat you’d like (mushrooms, spinach, peppers, ham, bacon, etc.).

Nutrition

Calories: 661kcal | Carbohydrates: 9g | Protein: 34g | Fat: 54g | Saturated Fat: 25g | Polyunsaturated Fat: 5g | Monounsaturated Fat: 19g | Trans Fat: 0.2g | Cholesterol: 407mg | Sodium: 906mg | Potassium: 523mg | Fiber: 1g | Sugar: 7g | Vitamin A: 1259IU | Vitamin C: 4mg | Calcium: 452mg | Iron: 2mg
Course: Breakfast
Cuisine: American
Keyword: breakfast, breakfast casserole, breakfast casserole recipe, breakfast ideas

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