Pumpkin Bran Muffins- Amy McAllister

I just saw this one online, haven't made it yet, but it looks awesome and healthy!

1 1/2 cups unprocessed oat bran
1/2 cup firmly packed brown sugar
1/2 cup all-purpose flour
2 teaspoons baking powder
1 teaspoon pumpkin pie spice
1/4 teaspoon salt
1 cup mashed pumpkin, , cooked
1/2 cup skim milk
2 egg whites, lightly beaten
2 tablespoons vegetable oil
vegetable oil cooking spray

Directions
1 Combine first six ingredients in a large bowl; stir well.
2 Make a well in center of mixture.
3 Combine pumpkin and next three ingredients; stir well.
4 Add to dry ingredients, stirring just until moistened.
5 Spoon into muffin pans coated with cooking spray, filling ¾ full.
6 Bake at 425 degrees for 20 minutes.
7 Remove from pans immediately; serve warm or at room temperature.
8 Banana Oat Bran Muffins: Substitute ¾ cup mashed ripe banana for pumpkin.
9 Apple-Oat Bran Muffins: Substitute 1/2 cup minced apple for pumpkin.
10 Substitute apple pie spice for pumpkin pie spice.
11 Add 1 Tsp ground cinnamon to dry ingredients.