In an electric mixer, mix together flour, baking powder, cinnamon, nutmeg, pumpkin pie spice, salt, and baking soda.
Mix in eggs, sugar, oil, and pumpkin. Mix well.
Pour in to greased 10X15 bar pan. Bake at 350 for 30 minutes, or until toothpick comes out clean.
Let bars cool completely and then make the frosting with butter, cream cheese, powdered sugar, extract, and whipping cream. Spread over cool bars and enjoy!!