Preheat oven to 325°. Grease a muffin pan or fill with cupcake liners.
In a medium bowl, combine flours, baking soda, pumpkin pie spice, cinnamon, and salt with a whisk. Set aside.
In a large bowl, cream butter and sugar with an electric mixer. Add egg white, egg, bananas, pumpkin, and vanilla, and beat at medium speed until thick. Scrape down sides of the bowl.
Add flour mixture, then blend at low speed until combined. Do not over mix.
Use a a small measuring cup to scoop batter evenly among muffin cups, making 12 muffins total. Bake on the center rack for 30-35 minutes, or until a toothpick inserted in the center comes out clean. Source: Skinnytaste