Step 2
Beat the pumpkin puree, white sugar, brown sugar, shortening, butter, milk, vegetable oil, and eggs together in a large bowl until smooth. Whisk the cake flour, dry buttermilk powder, cornstarch, pumpkin pie spice, baking powder, baking soda, and salt together in another bowl. Add the dry ingredients to the pumpkin mixture, stirring until mixed. Pour batter into the prepared muffin cups, filling each cup about 2/3 full.