Preheat oven to 400°F. Spray a 12-cup muffin pan with nonstick spray or line with paper muffin cups. Place the muffin pan on a baking sheet.
In a large bowl, whisk together the flours, cornmeal, oats, sugar, baking powder, baking soda and salt. In another bowl, whisk together buttermilk, maple syrup, eggs and melted butter. Pour liquid ingredients over dry ingredients and stir until incorporated. The batter will be lumpy (that's okay). Stir in the fruit. Divide the batter evenly among the muffin cups.
Bake 18 to 20 minutes, or until the tops are golden and a thin knife inserted into the center of the muffins comes out clean. Transfer the pan to a rack and cool for 5 minutes, then carefully lift each muffin out of its mold and onto the rack to cool.