Creating a delightful Berry Croissant Bake involves a few simple steps. Follow this guide to ensure your dish turns out perfectly:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter.
2. Prepare Croissants: Cut the croissants into halves or quarters and arrange them in the prepared baking dish.
3. Add Berries: Sprinkle the mixed berries evenly over the arranged croissants.
4. Mix the Custard: In a large bowl, whisk together the eggs, milk, sugar, vanilla extract, almond extract (if using), and salt until well combined.
5. Pour Custard: Pour the custard mixture evenly over the croissants and berries, ensuring everything is well soaked.
6. Soak: Allow the mixture to sit for about 15-20 minutes. This step helps the croissants absorb the custard.
7. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the top is golden brown and the custard is set.
8. Cool: Once baked, remove the dish from the oven and let it cool for about 10-15 minutes.
9. Serve: Dust with powdered sugar before slicing into portions.

These steps guide you through creating this scrumptious dish with ease.