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Blueberry French toast casserole in a glass baking dish with a slice removed, showing golden custard-soaked bread studded with blueberries, topped with powdered sugar, fresh blueberries, and mint leaves

Overnight Blueberry French Toast Casserole

A rich and custardy French toast bake loaded with juicy blueberries and topped with powdered sugar and maple syrup. Perfect for make-ahead holiday breakfasts.
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Course: Breakfast, Brunch
Cuisine: American
Prep Time: 15 minutes
Cook Time: 45 minutes
Soaking Time: 1 hour
Total Time: 1 hour
Servings: 8
Calories: 380kcal
Cost: $15

Equipment

  • 1 Baking dish (9x13 inch)
  • 1 Whisk (For custard)
  • 1 Mixing bowl (Large)

Ingredients

  • 1 loaf Brioche bread - Cubed
  • 2 cups Blueberries - Fresh or frozen
  • 8 large Eggs - Room temp
  • 2 cups Whole milk - Or almond milk
  • ½ cup Heavy cream - For richness
  • ½ cup Sugar - Granulated
  • 1 teaspoon Cinnamon - Ground
  • 1 tablespoon Vanilla - Extract
  • ¼ cup Maple syrup - For serving

Instructions 

  • Grease a 9x13 baking dish and arrange bread cubes and half the blueberries inside.
  • Whisk eggs, milk, cream, sugar, vanilla, and cinnamon until smooth.
  • Pour custard over bread, press down, cover, and refrigerate for at least 1 hour.
  • Preheat oven to 350°F and sprinkle brown sugar over the top.
  • Bake for 45-55 minutes until golden brown and set in the center.
  • Top with fresh blueberries, powdered sugar, and mint. Serve with warm syrup.

Notes

Use stale or day-old bread for the best absorption. Tent with foil if the top browns too quickly.

Nutrition

Serving: 1slice | Calories: 380kcal (19%) | Carbohydrates: 52g (17%) | Protein: 12g (24%) | Fat: 14g (22%) | Saturated Fat: 7g (44%) | Polyunsaturated Fat: 2g | Monounsaturated Fat: 4g | Cholesterol: 190mg (63%) | Sodium: 320mg (14%) | Potassium: 210mg (6%) | Fiber: 3g (13%) | Sugar: 28g (31%) | Vitamin A: 500IU (10%) | Vitamin C: 6mg (7%) | Calcium: 120mg (12%) | Iron: 2.1mg (12%)