For the fluffiest texture, make sure the bowl and beaters used for whipping egg whites are completely clean and free of grease, and avoid overfolding the whites into the cottage cheese mixture so the batter stays airy. You can customize the flavor by adding lemon zest, a dash of cinnamon, or swapping the blueberries for raspberries, and the bread slices can be gently toasted in a dry skillet or toaster oven to revive their freshly baked feel.