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effortless overnight breakfast Casserole

Effortless Overnight Breakfast Casserole: Wake Up to 15-Minute Magic!

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An easy overnight breakfast casserole with sausage, eggs, and vegetables that you can prepare ahead and bake in the morning.

  • Total Time: 1 hour
  • Yield: 8 servings 1x

Ingredients

Scale
  • 10 to 12 ounces (280-340g) sausage, casing removed
  • 1 tablespoon olive oil
  • 2 cloves garlic, minced
  • 3 cups (90g) fresh spinach
  • 2 large bell peppers, diced
  • ½ medium yellow onion, diced
  • Salt and pepper to taste
  • 12 large eggs
  • ½ cup (120g) milk (any type)
  • ½ cup (56g) shredded cheese (any flavor), divided

Instructions

  1. Spray a 7×11″ or 9×13″ casserole dish with non-stick spray. Set aside. If baking immediately, preheat oven to 375°F (191°C).
  2. Brown sausage in a skillet over medium heat. Skip if using pre-cooked sausage. Transfer to casserole dish.
  3. Sauté garlic, spinach, peppers, and onion in the same skillet for 6-7 minutes. Season with salt and pepper. Add to casserole dish.
  4. Whisk eggs, milk, and ¼ cup cheese together. Pour over sausage and vegetables. Top with remaining cheese.
  5. Cover and refrigerate overnight or bake immediately for 45 minutes at 375°F (191°C) until edges brown. Let cool 15 minutes before serving.

Notes

  • Refrigerate unbaked casserole up to 24 hours before baking.
  • Store leftovers in the fridge for up to 5 days.
  • Freeze unbaked casserole for up to 2 months. Thaw overnight before baking.
  • Reheat individual servings in the microwave.
  • Author: Livia Reed
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Category: Breakfast
  • Method: Baked
  • Cuisine: American
  • Diet: Low Lactose

Nutrition

  • Serving Size: 1 slice
  • Calories: 320
  • Sugar: 4g
  • Sodium: 480mg
  • Fat: 22g
  • Saturated Fat: 8g
  • Unsaturated Fat: 12g
  • Trans Fat: 0g
  • Carbohydrates: 8g
  • Fiber: 2g
  • Protein: 22g
  • Cholesterol: 280mg