Baked Brioche French Toast with Fresh Berries

Name: Baked Brioche French Toast with Fresh Berries
Ingredients: Unsalted butter for greasing; 6 eggs, lightly beaten; 2 cups (16 fl. oz./500 ml) milk; 2 Tbs. firmly packed light brown sugar; 1 Tbs. vanilla bean paste; 1/2 tsp. ground cinnamon; 1 loaf brioche, about 6 oz. (180 g), cut into slices 3/4 inch (2 cm) thick; Assorted fresh berries, such as strawberries, raspberries and blueberries, for serving; Confectioners’ sugar for dusting; Maple syrup for serving (optional); Whipped cream for serving (optional)