Preheat the oven to 350 degrees. Line 18 muffin cups with paper liners. In a medium mixing bowl, combine the flour, oats, baking powder, baking soda and salt. Stir together with a fork to blend. In a large mixing bowl, whisk together the applesauce, brown sugar, eggs, banana, peanut butter and buttermilk until smooth. Pour the dry ingredients into the bowl with the wet ingredients and mix just until incorporated and fully blended. Divide the batter between the prepared muffin cups. Bake 18-20 minutes, or until a toothpick inserted in the center comes out clean. Allow to cool in the pan5-10 minutes, then transfer to a wire rack to cool completely.
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