Mix the dry ingredients together; flour, baking powder,
salt, baking soda, and spices, and set aside.
Mix in another bowl the wet ingredients; sugar, oil, eggs,
pumpkin. Mix until eggs are well combined.
Preheat the oven to 350 F
Prepare a 13X9 cake pan, if you want cake; or a rimmed
sheet pan if you want bars. The pan needs to be greased.
Pour the batter into the pan, spread evenly.
Bake for about 30-40 minutes, until lightly browned and toothpick comes out clean.
Cream all the frosting ingredients together in a large
bowl. After cake is cooled, you can frost the cake.