Preheat oven to 350 degrees. Grease a jelly roll pan.
Using a medium bowl, combine the flour,baking powder,cinnamon and salt. Stir to combine, set aside.
Using a large bowl beat the sugar, butter and vanilla together. Add the eggs one at a time, beating well after each addition. Beat in the pumpkin. Gradually beat in the flour mixture.
Evenly spread the batter into your prepared jelly roll pan. Bake at 350 degrees for 20 -25 minutes or until tests done with a toothpick. Cool completely before frosting.