Annie's famous pumpkin bars

I know the holidays are over, and that the following recipe has now lost its seasonal appeal, but I'm posting it for my sake (if it's on the RBlog I can't lose it) as much as yours. This is one of my favorite recipes in the universe, passed on by Annie's mom. Annie has either been forced to dig up the recipe and send it to me, or actually make me some pumpkin bars, at least twice a year for the past five years. They are one of the yummiest things known to humankind, they're easy to make, and extremely versatile. You can enjoy them as a dessert, with tea or coffee, as breakfast...

Ingredients
Pumpkin bars:
4 eggs
1 2/3 cup of sugar
1 cup of vegetable oil
1 16 ounce can, pumpkin
2 cups of flour
2 tsp. baking powder
2 tsp. cinnamon
1 tsp. salt
1 tsp. baking soda

Cream cheese frosting:
1 3 ounce package of cream cheese
1/2 cup margarine
2 cups powdered sugar
1 tsp. vanilla

Directions
Pumpkin bars: In mixing bowl, beat together eggs, sugar, oil and pumpkin until light and fluffy.In separate bowl, stir together flour, baking powder, cinnamon, salt and baking soda. Add the mixed dry stuff to pumpkin mixture, and mix thoroughly. Spread batter in an ungreased pan (9x13 or 15x10). Bake at 350° for 25-30 minutes. Check to make sure it is set, like you would do for a cake.

Cream cheese frosting: Cream the first two ingredients together and stir in vanilla, then mix in sugar, slowly. Frost the pumpkin bars once they have cooled.