In a bowl, sift together the flour, baking powder, baking soda, cinnamon, ginger, nutmeg, and salt and stir to combine. Place the eggs and granulated sugar in the bowl of an electric mixer fitted with a paddle attachment. Alternatively you can use a hand-mixer. Beat on medium speed for 3 minutes. The batter should be pale yellow and thickened. Add the pumpkin and mix. Slowly add the flour mixture until incorporated. Finish mixing with a rubber spatula. Pour into prepared pan and spread evenly. The batter will be thin. Bake the cake for 10-12 minutes, until the top springs back when gently touched.