In a mixing bowl, beat eggs, sugar, oil and pumpkin. Combine flour, cinnamon, baking powder, baking soda and salt; gradually add to pumpkin mixture and mix well. Pour into an ungreased 15"x10"x1" baking pan( a cookie sheet with an edge will work)
Bake 350 degrees for 25-30 minutes. Cool completely.
For icing, beat cream cheese, sugar and butter and vanilla in small mixing bowl. Add enough milk to achieve desired spreading consistency. Spread over bars.