Beat eggs in mixing bowl. Add pumpkin, sugars, and oil and beat well. Add remaining ingredients. Beat until well blended. Spread into a greased 10x15 inch jelly roll pan. Bake at 180ºC or 20 to 25 minutes. Frost with cream cheese frosting. Frosting: Combine 3 ounces of cream cheese, half cup of margarine, 1 teaspoon vanilla, and 2 cups of powdered sugar. Mix together well. Spread onto cooled cake.