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Maximalist Grilled Cheese Casserole

A rich, layered casserole inspired by the classic grilled cheese sandwich, featuring melted cheddar, mozzarella, crispy bacon, tomatoes, and spinach baked between buttery sourdough slices.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 6 portions
Course: Dinner, Main Dish
Cuisine: American, Comfort Food
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Main Ingredients
  • 8 slices sourdough bread thick-cut
  • 2 tablespoons butter softened
  • 1 cup shredded sharp cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 1 cup cherry tomatoes halved
  • 1 small red onion thinly sliced
  • 2 cups fresh spinach leaves
  • 6 slices cooked bacon chopped
  • 4 large eggs
  • 1.5 cups whole milk
  • 0.5 teaspoon garlic powder
  • 0.5 teaspoon salt
  • 0.25 teaspoon black pepper
  • 2 tablespoons chopped chives for garnish

Equipment

  • Mixing bowls
  • Baking dish
  • Whisk
  • Oven

Method
 

  1. Preheat oven to 375°F (190°C) and grease a 9x13-inch baking dish.
  2. Butter one side of each bread slice and toast until golden.
  3. Layer half the bread, cheese, vegetables, and bacon in dish; repeat.
  4. Whisk eggs, milk, and seasonings, then pour over layers.
  5. Let rest 15 minutes, cover, and bake 25 minutes; uncover and bake 20 minutes more.
  6. Garnish with chives and serve warm.

Notes

This casserole is ideal for brunch, lunch, or dinner and reheats beautifully.