1Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 12x18 inch pan. Sift together the flour, baking powder, baking soda, salt and cinnamon. Set aside.
2In a large bowl combine sugar and oil. Blend in vanilla and pumpkin, then beat in eggs one at a time. Gradually beat in flour mixture. Stir in nuts. Spread batter into prepared 12x18 inch pan.
3Bake in the preheated oven for 30 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool.
Footnotes
Tip
Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.