Step-by-Step Instructions

Step 1: Prep the Ingredients

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or nonstick spray.
2. Tear the croissants into large, bite-sized pieces and scatter them evenly in the prepared baking dish. Sprinkle the blueberries over the top, ensuring an even distribution.

Step 2: Make the Custard

1. In a large mixing bowl, whisk together the eggs, milk, heavy cream, granulated sugar, brown sugar, vanilla extract, cinnamon, nutmeg, and lemon zest. Whisk until the mixture is smooth and well combined.

Step 3: Assemble the Bake

1. Pour the custard mixture evenly over the croissants and blueberries. Gently press the croissants down with the back of a spoon or your hands to help them absorb the custard.
2. Let the mixture sit for at least 10 minutes to allow the croissants to soak up the custard. For best results, cover the dish with plastic wrap and refrigerate for 2-12 hours to enhance the flavors and texture.

Step 4: Bake the French Toast

1. Remove the baking dish from the refrigerator (if chilled) and let it sit at room temperature for 15-20 minutes.
2. Bake uncovered in the preheated oven for 40-45 minutes, or until the top is golden brown and the custard is set. If the top browns too quickly, cover it loosely with aluminum foil during the last 10 minutes of baking.

Step 5: Serve and Enjoy

1. Remove the bake from the oven and let it cool slightly before serving. Dust with powdered sugar and serve with maple syrup and optional whipped cream.