In large bowl, whisk all-purpose and whole wheat flours, oats, baking powder, cinnamon, baking soda and salt.
Fill paper-lined or greased muffin cups three-quarters full. Sprinkle with topping. Bake in centre of 375°F (190°C) oven for 25 minutes or until tops are firm to the touch. Let cool in pan on rack for 5 minutes. Remove to rack to let cool completely. (Make-ahead: Store in airtight container for up to 2 days or wrap individually in plastic wrap and freeze in airtight container for up to 2 weeks.)