Fold in pumpkin pie spice. Gradually add powdered sugar ... mixer and add small dollops of frosting at a time and mix together until cake pop mixture reaches a play dough consistency.
Pour in buttermilk, and mix until just combined. Add in remaining flour mixture and mix until just combined. Pour batter into the prepared pan and spread into an even layer. Bake in the preheated oven ...
This recipe is one that you can make in about an hour with ingredients that you more than likely have on hand in the fall: canned pumpkin, evaporated milk, eggs, sugar, salt, butter, and a cake mix.