To prepare the Ultimate Banana Muffins recipe, first preheat the oven to 350 degrees F. In a large mixing bowl, combine the flour, baking powder, sugar, cinnamon, nutmeg and salt. Add the wet ingredients to the dry ingredients and mix until just combined. Pour the batter into the prepared muffin tin and bake for 18 to 20 minutes or until the muffins are golden brown.