Bread Pudding Croissant

INGREDIENTS - 6 to 8 slices of croissant toast or about five croissants, cut into 1 inch cubes - Turbinado sugar, optional - 180 mL buttermilk - 180 mL heavy cream - 45 g brown sugar - 42 g granulated sugar - 4 g of vanilla extract - 2 g ground cinnamon - pinch of salt - 3 eggs room tem