To prepare a easy whole wheat banana muffins recipe, first you need to prepare the bananas. First, you'll need: 1 cup (240 g) of whole grain flour, 1 tablespoon (15 ml) baking powder, 1/2 teaspoon (2.5 tsp) salt, and 14 teaspoon baking soda. Mix the dry ingredients with the wet ingredients until they're just combined. Then, pour the batter into the muffin pan and bake for 18 to 20 minutes, or until the tops are golden brown. Remove from the oven and let cool for 5 minutes before serving.