Pre heat oven to 350 degrees and grease and flour your bundt pan.
In a medium bowl combine flour, baking powder, baking soda, salt and pumpkin pie spice. Set aside.
In the bowl of a stand mixer combine the melted butter, oil, sugars, pumpkin puree, eggs, vanilla and beat on low until combined.
With the mixer on low slowly add the dry ingredients until combined and there are no more lumps.
Pour batter into mini bundt pans and bake for about 20 minutes. If you are using a large bundt pan it can take anywhere from 45-60 minutes. Keep an eye on the cake and remove from the oven when a toothpick comes out clean.
Let the cakes cool in the pan for about 10 minutes (20 for large cake) then turn pan upside down to let the cakes slide out. If needed use a small knife to loosen the edge of the cake from the pan.