These oatmeal-banana muffins strike the perfect balance of spice and sweetness. The oats soften while baking, making these muffins moist, tender and filling enough for breakfast. The riper the bananas, the sweeter the muffins will be. Browned bananas yield the strongest flavor, but yellow with some spots works just as well. If you don’t want to make muffins, bake the batter in a loaf pan until a wooden pick in the center comes out clean.