Overnight Everything Bagel Breakfast Casserole

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vernight Everything Bagel Breakfast Casserole

This Overnight Everything Bagel Breakfast Casserole is the perfect make-ahead dish for busy mornings. Packed with the delicious flavors of everything bagels, eggs, cheese, and savory breakfast ingredients, it’s simple to prepare the night before and bake in the morning for a hearty, satisfying breakfast!

Ingredients

  • 4 everything bagels, cubed (day-old works great)
  • 1 lb breakfast sausage (or bacon, cooked and crumbled)
  • 1/2 cup diced onion
  • 1/2 cup diced bell pepper (optional)
  • 8 large eggs
  • 2 cups whole milk
  • 1 1/2 cups shredded cheddar cheese
  • 1/2 cup shredded mozzarella cheese (optional)
  • 1/2 tsp garlic powder
  • 1/2 tsp salt
  • 1/4 tsp black pepper
  • 1/2 tsp dried thyme (optional)
  • 1 tbsp everything bagel seasoning (plus extra for topping)

Instructions

  1. Prepare the Sausage and Veggies:
    In a skillet, cook the sausage over medium heat until browned and crumbled. If you’re using onion and bell pepper, sauté them in the same pan until softened, about 5 minutes. Set aside to cool slightly.
  2. Assemble the Casserole:
    • Grease a 9×13-inch baking dish.
    • Cube the everything bagels and spread them evenly in the bottom of the dish.
    • Evenly distribute the sausage and vegetable mixture over the bagel cubes.
    • Sprinkle the shredded cheddar cheese (and mozzarella, if using) over the top.
    • Sprinkle 1 tablespoon of everything bagel seasoning evenly over the casserole.
  3. Make the Egg Mixture:
    In a large bowl, whisk together the eggs, milk, garlic powder, salt, pepper, and thyme until fully combined.
  4. Pour and Refrigerate:
    Pour the egg mixture over the bagel, sausage, and cheese layer, making sure everything is evenly soaked. Cover the baking dish tightly with plastic wrap or aluminum foil and refrigerate overnight (or for at least 4 hours).
  5. Bake the Casserole:
    Preheat the oven to 350°F (175°C). Remove the casserole from the fridge and let it come to room temperature while the oven preheats.
    Bake the casserole for 40-45 minutes, or until the eggs are fully set and the top is golden brown.
  6. Serve:
    Let the casserole cool for 5-10 minutes before slicing and serving. Top with extra everything bagel seasoning for a finishing touch.

Make-Ahead Tips

  • Overnight Prep: This casserole is perfect for prepping the night before! Just assemble it, refrigerate, and bake in the morning.
  • Freezing Option: You can also freeze the casserole. After assembling, cover it tightly and freeze for up to 2 months. To bake from frozen, add 15–20 minutes to the bake time.

Customization Ideas

  • Vegetarian Version: Skip the sausage and add spinach, mushrooms, or other vegetables of your choice.
  • Cheese Variations: Add cream cheese, feta, or Gruyère for different flavors.
  • Herbs: Fresh herbs like parsley or chives can add extra flavor to the casserole before serving.

Would you like suggestions for additional sides to serve with this casserole, like fruits or salads?

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