Preheat oven to 180°C.
Cut the bread into bite-sized cubes. Set aside.
Mix the milk, granulated sugar, egg, cinnamon powder, and butter. Cook over small heat until the mixture is warm and the sugar has dissolved.
Place the bread cubes into the tray, then pour the milk mixture on top. Add strawberry and blueberry pieces. Bake for 30-35 minutes.
After the berry french toast is baked, let it cool. Dust it with icing sugar before serving. Enjoy!