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Easy Overnight Egg and Sausage Breakfast Casserole

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A simple and delicious overnight breakfast casserole featuring sausage, eggs, and Gruyere cheese that bakes itself while you sleep, perfect for busy mornings or brunch.

Ingredients

Scale
  • 1 pound breakfast sausage, cooked and crumbled
  • 8 large eggs, room temperature
  • 2 cups whole milk (or almond/oat milk)
  • 6 cups cubed day-old bread (French or sourdough recommended)
  • 1 ½ cups shredded Gruyere cheese
  • ½ cup finely chopped onion, sautéed until translucent
  • 2 cloves garlic, minced
  • 1 tablespoon Dijon mustard (optional)
  • 2 tablespoons chopped fresh parsley or chives
  • Salt and pepper to taste
  • Butter or oil for greasing the baking dish

Instructions

  1. Cook the sausage in a skillet over medium heat until browned and cooked through, about 10-12 minutes. Remove with a slotted spoon and set aside.
  2. In the same skillet, add a little oil or butter and sauté the chopped onion and garlic until soft and translucent, about 4 minutes. Set aside.
  3. In a large bowl, whisk together the eggs and milk until fully combined and slightly frothy. Stir in Dijon mustard (if using), salt, and pepper.
  4. Lightly grease a 9×13-inch baking dish with butter or oil. Spread the cubed bread evenly across the dish.
  5. Sprinkle the cooked sausage and sautéed onions and garlic evenly over the bread.
  6. Sprinkle shredded Gruyere cheese over everything.
  7. Pour the egg mixture gently over the casserole, pressing down lightly to ensure the bread soaks it up.
  8. Cover the dish tightly with plastic wrap or foil and refrigerate for at least 6 hours or overnight.
  9. Preheat oven to 350°F (175°C). Remove casserole from fridge and let sit at room temperature for 15 minutes.
  10. Bake uncovered for 45-50 minutes until the top is golden brown and a knife inserted in the center comes out clean.
  11. Let the casserole rest for 5-10 minutes before slicing. Garnish with fresh parsley or chives if desired.

Notes

Use day-old bread to avoid sogginess. Let eggs and milk come to room temperature before mixing. If top browns too quickly, tent with foil halfway through baking. Toast bread cubes if too fresh. Rest casserole before slicing for best texture. Can substitute sausage with turkey or chicken sausage or omit for vegetarian version. Gruyere can be swapped with Emmental, Swiss, or cheddar cheese.

Nutrition

Keywords: breakfast casserole, overnight casserole, sausage casserole, egg casserole, Gruyere cheese, easy breakfast, brunch recipe

Find it online: https://elaraeats.com/easy-overnight-egg-and-sausage-breakfast-casserole-recipe-for-perfect-morning-meals/