2/3 c. soft butter
1 2/3 c. sugar
2 c. grated zucchini with skin
2 c. flour
2/3 c. cocoa
1/4 tsp. baking powder
1 1/4 tsp. baking soda
1/2 c. water
1 tsp. vanilla

Beat butter, sugar, and zucchini until fluffy. Blend flour, cocoa, baking powder, and baking soda. Add alternately with water and vanilla. Grease 9x12 inch pan. Bake at 350 degrees for 40-50 minutes.

PEANUT BUTTER ICING:

1 1/2 c. hot water
1 1/2 c. sugar
3 tbsp. cocoa
4 1/2 tbsp. cornstarch

Cook until thick. Add 1 1/2 teaspoon vanilla, 4 1/2 tablespoon butter, and 1 cup peanut butter.