To bake as a loaf without the crumble topping, pour the banana bread batter into a buttered 9-by-5-by-3-inch loaf pan. Bake at 350 degrees F until a toothpick inserted in the center of the bread comes out clean, about 55 minutes. Cool the bread in the pan on a wire rack for 5 minutes, then turn the bread out of the pan onto the rack to cool completely.