1. Step
Preheat oven to 425 degrees F. Lightly grease a 24-cup mini muffin tin with cooking spray. Whisk together pumpkin, oil, granulated sugar, brown sugar, milk, eggs and vanilla in a medium bowl until smooth. Whisk together flour, baking powder, pumpkin pie spice and salt in another medium bowl. Add flour mixture to pumpkin mixture and stir until mixture just comes together. Stir in 1/3 cup of the chocolate chips.