Description
Start your morning off right with this warm and comforting Grilled Cheese Breakfast Casserole! This twist on a classic grilled cheese sandwich is baked into a savory, cheesy casserole that’s loaded with golden bread, gooey cheese, and fluffy eggs. It’s an easy crowd-pleaser perfect for weekend brunches, holiday mornings, or make-ahead meal prep.
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Ingredients
For the Casserole:
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1 loaf thick-cut white bread or sourdough, cut into 1-inch cubes
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2 cups shredded cheddar cheese
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1 cup shredded mozzarella cheese
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6 large eggs
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2 cups milk (whole or 2%)
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½ cup heavy cream
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1 tsp Dijon mustard
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½ tsp garlic powder
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½ tsp salt
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¼ tsp black pepper
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2 tbsp unsalted butter, melted
Optional Add-Ins:
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½ cup cooked breakfast sausage or chopped beef bacon
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½ cup sautéed spinach or mushrooms
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¼ cup green onions or chives, chopped
For Garnish:
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Extra shredded cheese on top
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Chopped parsley or green onions
Instructions
Step 1: Prep the Bread and Cheese
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Cut bread into 1-inch cubes and let it sit out for a few hours to dry slightly, or toast lightly for a firmer texture.
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Grease your baking dish with melted butter or nonstick spray.
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Add half of the bread cubes to the bottom of the baking dish.
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Sprinkle with half of the cheddar and mozzarella cheese.
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Add any optional cooked add-ins like sausage or veggies.
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Repeat with the remaining bread and cheese, layering them evenly.
Step 2: Make the Egg Mixture
7. In a large bowl, whisk together eggs, milk, cream, Dijon mustard, garlic powder, salt, and pepper until well combined.
8. Pour the egg mixture evenly over the layered bread and cheese in the dish.
9. Press down gently to help the bread absorb the liquid.
Step 3: Chill or Bake
10. For best results, cover the casserole and refrigerate for at least 1 hour or overnight. This allows the bread to soak up the custard.
11. If baking immediately, let it sit at room temperature for 15 minutes.
Step 4: Bake the Casserole
12. Preheat the oven to 350°F (175°C).
13. Uncover the casserole and sprinkle with extra cheese on top.
14. Bake for 40–45 minutes, or until the top is golden and the center is set.
15. Let it rest for 5–10 minutes before slicing.
Step 5: Garnish & Serve
16. Garnish with chopped parsley or green onions for a fresh finish.
17. Serve warm with fruit, salad, or a side of crispy potatoes.
Notes
Use Day-Old Bread – Slightly stale bread holds its shape better and soaks up the egg mixture.
Add Veggies – Sautéed mushrooms, spinach, or bell peppers add nutrition and flavor.
Let It Rest – Resting after baking ensures clean slices and a perfect texture.
Double the Cheese – Extra cheese on top creates a golden, bubbly crust.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Cuisine: American