Gather your ingredients. Grease 9×13 baking dish.
In a large mixing bowl, whisk almond milk, eggs, brown sugar, cinnamon, vanilla and salt.
Dip each sliced croissant into mixture, being sure to coat thoroughly, and lay in bottom of baking dish.
Add sliced strawberries and blueberries to bottom player of croissants.
Dip remaining croissants and layer on top of fruit. Top with remaining berries.
Pour remaining liquid over croissants and berries.
Cover tightly and refrigerate over night.