Preheat the oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the pumpkin puree, vegetable oil, brown sugar, eggs, and vanilla extract until smooth.
In a separate bowl, combine the flour, baking soda, baking powder, cinnamon, nutmeg, and salt.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
Fold in the chocolate chips gently until evenly distributed.
Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
Bake in the preheated oven for 20-25 minutes or until a toothpick inserted comes out clean.
Allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack.
Enjoy warm or at room temperature.
Store any leftovers in an airtight container.