01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease each cup.
02 - In a large mixing bowl, whisk together mashed sweet potato, pumpkin purée, eggs, melted butter, whole milk, vanilla extract, and packed brown sugar until the mixture is smooth and well incorporated.
03 - In a second bowl, whisk together all-purpose flour, baking powder, baking soda, salt, ground cinnamon, nutmeg, ginger, and cloves.
04 - Gradually add the dry ingredient blend to the wet mixture, stirring gently with a rubber spatula until just combined. Avoid overmixing for optimal muffin texture.
05 - Gently fold in the semi-sweet chocolate chips using a spatula until evenly distributed throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
07 - Bake in the preheated oven for 20 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean or with a few moist crumbs.
08 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving.