Step 1

Preheat oven to 350 degrees F. Coat a muffin tin with cooking spray.

Step 2

Whisk flour, pumpkin pie spice, baking powder, baking soda and salt in a medium bowl.

Step 3

Whisk pumpkin puree, brown sugar, buttermilk, butter, eggs and vanilla in a large bowl. Add the dry ingredients and stir with a wooden spoon until just combined. Fold in the chocolate chips.

Step 4

Divide the batter between the muffin cups. Bake until a toothpick inserted in the center comes out clean, about 25 minutes. Let cool in the pan for 5 minutes before turning out onto a wire rack.