Preheat oven to 375 degrees.

Lightly spray doughnut tin with nonstick cooking spray.

In a medium bowl, mix together flour, baking powder, baking soda and salt.

In a large mixing bowl, whisk together egg, sugar, pumpkin, buttermilk, melted butter, pumpkin spice and vanilla.

Slowly whisk in dry ingredients until smooth.

Place batter in a large plastic baggie.

Cut a small slit in one corner of the plastic bag to pipe your batter into the doughnut tins.

Fill doughnut tins around 2/3 full of batter for a thicker doughnut.

Bake for around 10 minutes or until tops have lightly browned.

Remove from tin and allow to cool completely before icing.

Prepare Icing:

Beat together butter, cream cheese, vanilla and confectioners sugar until smooth.

Spread desired amount over the tops of each doughnut.

Add sprinkles to the tops if desired.