Zucchini Brownies

Step 1
Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 inch baking pan.

Step 2
In a large bowl, mix together the oil, sugar and 2 teaspoons vanilla until well blended. Combine the flour, 1/2 cup cocoa, baking soda and salt; stir into the sugar mixture. Fold in the zucchini and walnuts. Spread evenly into the prepared pan.

Step 3
Bake for 25 to 30 minutes in the preheated oven, until brownies spring back when gently touched.

Step 4
Make frosting while brownies cool. Melt together the 6 tablespoons of cocoa and margarine; set aside to cool.

Step 5
Meanwhile, blend together the confectioners' sugar, milk and 1/2 teaspoon vanilla. Stir in the cocoa mixture. Spread over cooled brownies before cutting into squares.