Harvest Brownies or Pumpkin Cake in a Jelly Roll Pan

I bid on the cake during the 2000 Cub scout cake auction.  It cost me $40 and I think it was really worth it.  Marilee Olson gave me her recipe for it and I have been frequently baking it ever since.  Thanks, Marilee.

2 C. pumpkin or squash

4 eggs

¾ C. oil

2 tsp. vanilla

2 C. flour (optional:  try using 1 C. whole wheat flour as one-half of the flour)

2 C. sugar

1 T. pumpkin pie spice (I use 1 scant tsp. of the following: nutmeg, cloves and ginger.)

2 tsp. cinnamon

2 tsp. baking powder

2 tsp. baking soda

½ tsp. salt

Combine and bake at 350 F for 20-25 minutes in a 10 x15x1 jelly roll pan.

Frosting

6 T. butter

3 ounces cream cheese

1 tsp. vanilla

1 tsp. milk

1/8 tsp. salt

2 to 3 C. powdered sugar