Preheat oven to 375 F. Lightly grease a muffin pan. Combine oats, pumpkin seeds, peanuts and brown sugar in a small bowl and set aside.
In a large bowl, stir flours with sugar, baking powder, five-spice powder and salt. In a medium bowl, whisk pumpkin with oil, water, eggs and vanilla. Whisk in peanut butter. Pour onto flour mixture and stir until combined.
Spoon batter into prepared muffins pan and sprinkle with topping. Bake for 22 minutes or until tester comes out clean. Let cool in pan for 5 minutes then transfer to a rack to cool completely.