Directions:

1. Preheat oven to 350°F. Spray a 12-cup muffin pan with nonstick cooking spray.
2. Combine the flour, oats, pumpkin pie spice, baking powder, baking soda and salt in a bowl. Mix and set aside.
3. Combine brown sugar, sweet potato, egg, and vegetable oil in a separate bowl. Whip with a hand mixer or a sturdy whisk. The mixture should be slightly lumpy.
4. Fold in dry ingredients. Portion muffin mixture into prepared muffin pan. Fill cups ¾  to the rim.
5. In a small bowl, combine all ingredients for streusel. Mix until small clumps of dough form. Top muffins with prepared streusel.
6. Bake until golden brown and a toothpick comes out clean when inserted into the center of the muffin, 15-20 minutes.