Preheat the Oven: Start by preheating your oven to 350°F (175°C) and lining a muffin tin with paper liners or greasing it lightly.
Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg until well combined.
Combine Sugars: In another bowl, mix the granulated sugar and brown sugar together, then add in the pumpkin puree, vegetable oil, eggs, and vanilla extract. Stir until smooth.
Combine Wet and Dry: Gradually fold the dry ingredients into the wet mixture until just combined. Be careful not to overmix; a few lumps are okay!
Add Chocolate Chips: Gently fold in the chocolate chips, ensuring they're evenly distributed throughout the batter.
Fill Muffin Tin: Divide the batter evenly among the prepared muffin cups, filling each about 2/3 full.
Bake: Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Remove from the oven and allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.