In a standing mixer, combine the all-purpose flour, whole-wheat flour, rolled oats, ground cinnamon, baking powder, baking soda, salt and mashed banana, and blend on low speed for 2 minutes. Add the walnuts, brown sugar, vegetable oil, eggs and reduced-fat buttermilk, and blend for 2 minutes on medium speed. Add the vanilla extract and mix until well combined.
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Using an ice cream scoop, portion the batter evenly into the muffin tin, and top each muffin with 3 to 4 chocolate chips. Bake at 400 degrees for 15 minutes. Once muffins are baked through, remove them from the oven and let cool. Serve.
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