Get out the big mixing bowl and beat together eggs, sugar, oil and pumpkin. Combine the dry ingredients, flour, cinnamon, baking powder, baking soda and salt. Gradually add this to the pumpkin mixture and beat together well. Pour your mixture into an ungreased jellyroll pan and bake at 350 degrees F for 27 minutes or until a toothpick comes out clean. Allow to cool before frosting.
Beat together cream cheese, sugar, butter and vanilla. Add just enough milk to help get a nice spreading consistency. You can add a few drops of orange or green food coloring to make them even more trick-or-treat like!