Heat oven to 350°F.
Cut croissants into bite-sized pieces.
Put croissant pieces in baking dish.
Add fresh berries on top evenly.
Beat eggs in large mixing bowl.
Add milk and cream to eggs.
Mix in sugar and vanilla extract.
Add salt and melted butter.
Whisk everything together until smooth.
Pour mixture over croissants and berries.
Press down gently with spoon.
Let sit for 15 minutes.
Cover with foil and bake 30 minutes.
Remove foil and bake 15 more minutes.
Dust with powdered sugar before serving.