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Cheesy Baked Sandwich Bread Casserole

A nostalgic, homestyle casserole that layers slices of buttered bread with generous handfuls of shredded cheese, then envelopes them in a savory, seasoned custard before baking to golden perfection. This dish evokes classic comfort, ideal for family meals or communal gatherings.
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Course: Casserole, Main Course
Cuisine: American
Keyword: Cheesy Baked Sandwich Bread Casserole
Prep Time: 15 minutes
Cook Time: 35 minutes
Total Time: 50 minutes
Servings: 12 portions

Ingredients

  • 2 tablespoons of softened butter for spreading
  • 2 cups grated Colby-Jack or cheddar cheese divided
  • 12 slices of sandwich bread white or whole wheat
  • 2 cups whole milk
  • 3 eggs large
  • ¼ teaspoon ground mustard powder optional, for added depth
  • ¼ teaspoon ground black pepper
  • 1 small onion finely diced (optional)
  • ½ teaspoon fine salt

Instructions

  • Coat one side of each bread slice with a thin layer of softened butter.
  • Place 6 of the buttered slices into a lightly greased 9x13-inch baking dish, arranging them with the buttered side facing downward.
  • Evenly scatter 1 cup of the grated cheese across the bread layer. If using, sprinkle the chopped onion over the cheese.
  • Lay the remaining 6 slices of bread on top of the cheese, this time with the buttered sides facing up.
  • Distribute the remaining cup of shredded cheese over the upper bread layer.
  • In a separate mixing bowl, whisk together the milk, eggs, salt, black pepper, and ground mustard until well combined and smooth.
  • Gently pour the egg mixture over the layered bread and cheese, ensuring even coverage throughout the dish.
  • Allow the casserole to rest at room temperature for 10 minutes so the bread can absorb the liquid custard.
  • Transfer to a preheated oven set at 350°F (175°C) and bake uncovered for 30 to 35 minutes, or until the center is firm and the top develops a golden crust.
  • Remove from oven and allow the casserole to rest for 5 minutes before cutting into squares and serving.
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Notes

The inclusion of mustard and onion is optional but recommended for a deeper flavor profile. This dish is best served warm and can be prepared in advance for convenience.