Preheat oven to 400°F with the middle rack at the ready. Line a muffin pan with 12 paper liners.
Place the flours, chocolate chips, cocoa powder, baking powder and baking soda in a large bowl and make a well in the center. Beat the egg and egg whites briefly in another large bowl then beat in the milk, yogurt, maple syrup and oil until smooth and well-combined. Mix the wet mixture into the dry ingredients with as few stirs as possible to get a wet, sloppy mixture.