I made these for the first time today, and they are SO good! Just had to post the recipe. :o)
Beat 4 eggs, 1 cup oil, 1.5 cups sugar, and 2 cups packed pumpkin until creamy. Add 2 cups flour, 2 tsp. baking powder, 2 tsp. cinnamon, 1 tsp. salt, and 1 tsp. baking soda. Beat until well blended. Spread the batter in a lightly greased jelly roll pan. Bake for 20-25 minutes @ 350 degrees or until toothpick comes out clean. Cool completely.
Beat together one stick butter and one 8 oz. package cream cheese, both softened. Add 2.5 cups powdered sugar and 1.5 tsp. vanilla. Beat until smooth. Spread on cooled cake.