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Overnight Breakfast Casserole

This overnight breakfast casserole is pretty and colorful, with a good balance of vegetables and sausage, tender eggs, and hash browns. It's easy to put together, and makes enough for a crowd.

Slice of Overnight Breakfast Casserole on a plate with a fork, next to a casserole dish and orange juice in a glass
Prep Time:
15 mins
Cook Time:
50 mins
Chill Time:
8 hrs
Stand Time:
10 mins
Total Time:
9 hrs 15 mins
Servings:
12
Jump to Nutrition Facts

Ingredients

Original recipe (1X) yields 12 servings

  • cooking spray

  • 1/2 (32 ounce) package frozen diced hash brown potatoes

  • 1 pound bulk pork sausage

  • 1 red bell pepper, chopped

  • 1 yellow bell pepper, chopped

  • 1/2 cup chopped onion

  • 2 cloves garlic, minced

  • 1/2 teaspoon dried oregano

  • 4 cups fresh spinach

  • 4 ounces Monterey Jack cheese, shredded

  • 12 large eggs

  • 2/3 cup whole milk

  • 2 teaspoons Dijon mustard

  • 1/2 teaspoon salt

  • 1/4 teaspoon freshly ground black pepper

Directions

  1. Gather all ingredients.

    Overnight Breakfast Casserole ingredients on a counter

    Dotdash Meredith Food Studios

  2. Grease a 9x13 baking dish with cooking spray. Spread hash browns in the prepared baking dish.

    White casserole dish filled with raw diced potatoes

    Dotdash Meredith Food Studios

  3. Cook sausage over medium heat in a large skillet until starting to brown, about 2 minutes. 

    Ground sausage cooking in a skillet with a wooden spatula

    Dotdash Meredith Food Studios

  4. Add bell peppers, onion, garlic, and oregano to skillet. Continue cooking until vegetables are tender and sausage is no longer pink, about 5 minutes. Add spinach; cook until wilted, about 1 minute.

    Cooked sausage with spinach and bell peppers in a skillet with a wooden spatula

    Dotdash Meredith Food Studios

  5. Spread vegetable and sausage mixture over hash browns in the baking dish. Sprinkle cheese over the top.

    Casserole dish topped with shredded cheese and vegetables

    Dotdash Meredith Food Studios

  6. Beat eggs, milk, mustard, salt, and pepper together in a bowl. Pour egg mixture over casserole. Cover and refrigerate 8 hours to overnight.

    Egg mixture being poured over casserole ingredients in dish

    Dotdash Meredith Food Studios

  7. Preheat the oven to 325 degrees F (165 degrees C). 

  8. Bake casserole, uncovered, in the preheated oven until a knife inserted in the center comes out clean, 50 to 60 minutes. Let stand 10 minutes before serving.

    Sliced piece of overnight breakfast casserole served on a plate next to a casserole dish on a cooling rack

    Dotdash Meredith Food Studios

Nutrition Facts (per serving)

357 Calories
25g Fat
16g Carbs
18g Protein
Nutrition Facts
Servings Per Recipe 12
Calories 357
% Daily Value *
Total Fat 25g 32%
Saturated Fat 8g 40%
Cholesterol 228mg 76%
Sodium 775mg 34%
Total Carbohydrate 16g 6%
Dietary Fiber 2g 6%
Total Sugars 2g
Protein 18g 36%
Vitamin C 50mg 56%
Calcium 143mg 11%
Iron 2mg 12%
Potassium 488mg 10%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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