Stir together flour, baking powder, cinnamon, baking soda, and salt. Combine eggs, pumpkin, sugar, and oil. Beat until combined. Add dry ingredients and beat until well combined. Spread batter in an ungreased 15x10x1 baking pan. Bake at 350 for 25 to 30 minutes. Cool. Frost with Cream Cheese Frosting. Cut into bars.