Preheat the oven to 400 degrees F, and line each of the wells of the cupcake pan with a foil cupcake liner.
Combine in a bowl the flour, oatmeal, baking soda, salt, cinnamon and pumpkin pie spice.
Mix in a second bowl the egg whites, vanilla extract, brown sugar, vegetable oil and pumpkin puree.
Stir the oatmeal mixture into the pumpkin mixture until the batter just becomes moistened, but do not overmix.
Divide the batter evenly among the 12 cupcake liners, filling each no more than 2/3 full.
Bake the muffins at 375 degrees F for 20 to 25 minutes or until, upon inserting a toothpick into the center muffin, it comes out cleanly.