Special equipment: two 24-cup mini muffin tins
Preheat the oven to 350 degrees F. Coat the cups of two 24-cup mini muffin tins with cooking spray.
Whisk together the flour, baking powder, pumpkin pie spice, salt, baking soda and chocolate chips in a medium bowl. Whisk together the butter, sugar, sweet potato, sour cream and egg in a large bowl until well mixed. Fold the flour mixture into the sweet potato mixture, and stir until just combined (it's OK if there are some lumps).
Fill each muffin cup with a generous tablespoon of batter. Bake until the muffins have pulled away from the sides of the tins and a toothpick inserted in the center of a muffin comes out clean, 12 to 16 minutes. Tip the muffins out onto a cooling rack. Serve warm or at room temperature.
When measuring flour, we spoon it into a dry measuring cup and level off the excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.) Never leave a child unattended in the kitchen. Limit the child to tasks that are safe and age-appropriate.
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