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breakfast casserole

Hearty Breakfast Casserole: Perfect for Busy Mornings

This breakfast casserole is a wholesome, make-ahead dish that's perfect for feeding a crowd.
Prep Time 15 minutes
Cook Time 45 minutes
Resting Time 5 minutes
Total Time 1 hour 5 minutes
Course Breakfast
Cuisine American
Servings 8 slices
Calories 350 kcal

Equipment

  • Oven
  • Baking sheet
  • Mixing bowl
  • - Skillet
  • 9×13-inch baking dish

Ingredients
  

For the Base

  • 2 pounds Yukon Gold Potatoes Can substitute with 1 pound of frozen hash browns for convenience.
  • 2 tablespoons Extra-Virgin Olive Oil Adds healthy fat and enhances flavor during roasting.
  • 1 teaspoon Sea Salt Enhances the flavors of the vegetables and layers; adjust to taste as needed.

For the Egg Mixture

  • 8 large Large Eggs Provides structure and protein for the casserole; essential for a satisfying meal.
  • 1 cup Milk Adds creaminess; can substitute with any non-dairy milk if preferred.

For the Vegetables

  • 1 medium Yellow Onion Adds sweetness and depth; can be replaced with shallots for a different profile.
  • 2 cloves Garlic Cloves Provides aromatic flavor; feel free to omit if you're sensitive to garlic.
  • 1 medium Red Bell Pepper Contributes sweetness; use green bell peppers as a substitute for a more peppery note.
  • 1 medium Green Bell Pepper Adds color and crunch; can swap for any colorful pepper to enhance visual appeal.
  • 2 cups Fresh Spinach Offers a nutritional boost; substitute with kale or swiss chard for variety.
  • 1/2 cup Green Onions Gives a fresh, mild onion flavor; regular onions can be used for a bolder taste.

For the Topping

  • 2 cups Shredded Cheddar Cheese Melts beautifully and adds flavor; consider using pepper jack for a spicy kick.

Instructions
 

How to Make Breakfast Casserole

  • Preheat your oven to 425°F for achieving crispy, delicious potatoes.
  • Chop the Yukon Gold potatoes into small cubes, toss with olive oil and sea salt, then roast for 20-25 minutes.
  • In a large bowl, whisk together the eggs, milk, and a pinch of sea salt.
  • Sauté yellow onion in olive oil, then add bell peppers, garlic, spinach, and half of the green onions.
  • Grease a baking dish, layer roasted potatoes, cheese, sautéed veggies, and pour the egg mixture over it.
  • Lower oven temperature to 350°F and bake for 40-45 minutes, then let it rest for 5 minutes before slicing.

Notes

Feel free to customize the ingredients based on your preferences or what you have on hand.
Keyword breakfast casserole, brunch, comfort food, crowd-pleaser, easy recipe, Make-Ahead