Preheat oven to 350 degrees F.
In a medium mixing bowl, mix together flour, pumpkin pie spice, cinnamon, baking soda, baking powder, and salt until combined then set aside.
In a large mixing bowl add oil, milk, eggs, vanilla, granulated and brown sugars then whisk together. Add in the pumpkin puree and mix once more until smooth.
Pour the dry into the wet ingredients and mix until just combined.
Transfer the batter to your lined muffin tin. Bake in preheated oven for 15-18 minutes, or until a toothpick comes out clean. Let pumpkin muffins cool in the pan for about 5 minutes, then remove them and transfer muffins to a wire rack to cool completely. ENJOY!