Preheat oven to 375. Prepare a 12 cup muffin tin with cupcake liners.
In medium bowl,mix together dry ingredients except chocolate chips.
In separate bowl, combine wet ingredients.
Mix wet and dry ingredients together just until combined.
Fold in chocolate chips.
Divide batter into 12 muffin cups. Top with additional chocolate chips.
Bake 18-20 minutes. Allow to rest in muffin pan for 5 minutes before removing to cooling rack.