This Grand Marnier French Toast Casserole is a make-ahead breakfast bake that turns sturdy bread into a custardy, orange-kissed dish with a crisp, caramelized top. The orange liqueur adds a warm, boozy brightness that pairs beautifully with vanilla and cinnamon, while the overnight soak ensures every bite is soft and rich. It’s an elegant choice for brunch or holidays because you can assemble it the night before and pop it in the oven while guests gather.
Ingredients
- 1 large loaf (about 16 oz / 450 g) brioche or challah bread, cut into 1-inch cubes
- 8 large eggs
- 2 cups (480 ml) whole milk
- 1 cup (240 ml) heavy cream
- 3/4 cup (150 g) granulated sugar
- 1/4 cup (60 ml) Grand Marnier (or other orange liqueur)
- 2 tablespoons orange zest (from about 2 oranges)
- 1 tablespoon vanilla extract
- 1 teaspoon ground cinnamon
- 1/4 teaspoon ground nutmeg
- 1/4 teaspoon salt
- For the topping: 1/2 cup (100 g) packed brown sugar
- 1/2 cup (60 g) all-purpose flour
- 1/4 cup (60 g) cold unsalted butter, cut into small pieces
- Pinch of salt
Instructions
- Lightly grease a 9×13-inch (23×33 cm) baking dish. Spread the bread cubes evenly in the dish.
- In a large bowl, whisk together the eggs, milk, heavy cream, granulated sugar, Grand Marnier, orange zest, vanilla, cinnamon, nutmeg, and salt until the sugar is dissolved and the mixture is smooth.
- Pour the custard evenly over the bread. Gently press the bread down with a spatula to help it soak. Cover the dish with plastic wrap and refrigerate for at least 8 hours, or overnight.
- In a small bowl, combine the brown sugar, flour, cold butter, and a pinch of salt. Use a pastry cutter or your fingers to work the butter into the dry ingredients until the mixture resembles coarse crumbs. Cover and refrigerate until ready to bake.
- When ready to bake, preheat the oven to 350°F (175°C). Remove the plastic wrap from the casserole and let it sit on the counter for 20–30 minutes while the oven heats.
- Sprinkle the crumb topping evenly over the casserole.
- Bake for 45–55 minutes, until the top is golden and the center is set (a knife inserted near the center should come out clean). The internal temperature should reach 160°F (71°C) as the safe minimum for egg dishes, per USDA FSIS guidelines. Check with a food thermometer.
- Let the casserole rest for 10 minutes before serving. Serve warm.
Tips
- Bread choice: Brioche or challah work best because they are rich and sturdy. If using a regular sandwich loaf, reduce the milk to 1 3/4 cups (420 ml) to avoid a soggy casserole.
- Don’t skip the soak: The overnight rest is essential for the bread to absorb the custard. If you’re short on time, let it sit at room temperature for 1 hour, but the texture won’t be as creamy.
- Check for doneness: The center should be slightly puffed and set, not jiggly. If the top browns too quickly, loosely cover with foil for the last 15 minutes.
- Grand Marnier substitute: If you don’t have Grand Marnier, use any orange liqueur like Cointreau or Triple Sec. For a non-alcoholic version, replace it with 1/4 cup (60 ml) orange juice plus 1 teaspoon orange extract.
Serving Suggestions
Serve warm with a dusting of powdered sugar, a drizzle of maple syrup, or a spoonful of whipped cream. Fresh berries or a citrus salad brighten the plate. For a brunch spread, pair it with crispy bacon or sausage and a pot of coffee or mimosas (for adults of legal drinking age).
Variations
- Berry twist: Scatter 1 cup (150 g) fresh or frozen blueberries or raspberries over the bread before pouring the custard.
- Chocolate-orange: Add 1/2 cup (90 g) dark chocolate chips to the bread cubes along with the custard.
- Nutty crunch: Fold 1/2 cup (60 g) chopped toasted pecans or walnuts into the crumb topping.
- Spiced version: Increase the cinnamon to 1 1/2 teaspoons and add 1/2 teaspoon ground ginger for a warmer spice profile.
Storage and Reheating
Refrigerate leftovers in an airtight container for up to 3 days. To reheat, place a portion in the microwave for 30–60 seconds, or warm in a 350°F (175°C) oven for 10–15 minutes until heated through. The casserole can also be frozen before baking: assemble, cover tightly, and freeze for up to 2 months. Thaw overnight in the refrigerator, then bake as directed, adding 10 minutes to the baking time.
Frequently Asked Questions
Can I make this casserole without the alcohol?
Yes. Replace the Grand Marnier with 1/4 cup (60 ml) orange juice and add 1 teaspoon orange extract to keep the orange flavor. The texture will be slightly thinner, but the casserole will still be delicious.
Can I use a different type of bread?
Absolutely. Sourdough, French bread, or even croissants work well. Just make sure the bread is slightly stale or dried out so it absorbs the custard without turning mushy. If using fresh bread, toast the cubes lightly in the oven for 10 minutes before assembling.
Why is my casserole soggy in the middle?
This usually happens if the bread was too soft or the custard-to-bread ratio was too high. Use a sturdy bread like brioche or challah, and don’t oversoak. If the middle is still wet after baking, return it to the oven for 5–10 more minutes, checking the temperature reaches 160°F (71°C).
Can I bake it immediately without refrigerating?
Yes, but the bread won’t absorb the custard as fully, so the texture will be less creamy. If baking immediately, let the casserole sit for 30 minutes at room temperature before baking, and expect a slightly firmer texture.
How do I know when it’s done?
The top should be golden brown and the center should be set. A knife inserted near the center should come out clean, and the internal temperature should read 160°F (71°C) on a food thermometer. This ensures the eggs are fully cooked.
Can I double the recipe?
Yes, use a larger baking dish (or two 9×13-inch dishes) and increase the baking time by 10–15 minutes. Make sure the casserole is not too deep, or it may not cook evenly. Check the temperature in the center.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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