Preheat oven to 375°.
Lightly spoon flour into dry measuring cups; level with a knife. Combine flour and next 5 ingredients (flour through salt) in a medium bowl, stirring with a whisk. Make a well in center of mixture.
Combine pumpkin and next 6 ingredients (pumpkin through egg white); add to flour mixture, stirring just until moist. Spoon the batter into 18 muffin cups coated with cooking spray.
Combine 1 tablespoon granulated sugar and brown sugar; sprinkle over muffins.
Bake at 375° for 25 minutes or until muffins spring back when touched lightly in center. Remove muffins from pans immediately; cool on a wire rack.