Preheat oven to 375 degrees.
Spoon flour in measuring cup, level with a knife.
Combine flour and next 8 ingredients in a medium bowl.
Make a well in the center of mixture.
Combine pumpkin and next 5 ingredients, add to the flour mixture, stirring just until moist.
Spoon batter into 18 muffin cups, sprayed lightly with cooking spray.
Bake at 375 degrees for 20-25 minutes or until muffins spring back when touched lightly in the center.
Remove muffins from pans and cool on a wire rack.