1. Combine flour, sugar, cocoa powder and baking soda in a bowl.
2. Add egg, egg whites, buttermilk and oil. Mix in kitchen aid for about 1 minute.
3. Line your muffin pan with liners and spray with cooking spray. Add batter to the cups using an ice cream scooper. Cups should be 2/3 full.
4. Bake at 350F for 18 to 20 minutes, or until a toothpick inserted in the middle comes out clean.