Good-Cooking - Zucchini Cocoa Brownies

Ingredients

• 2 cups grated zucchini
• 1/2 cup chopped nuts
• 2 teaspoons vanilla extract
• 1/2 cup oil
• 2 cups all-purpose flour
• 1 1/4 cups granulated sugar
• 1 teaspoon salt
• 1 1/2 teaspoons baking soda
• 1/2 cup cocoa
• 1 egg, beaten
• 1/3 cup margarine, melted
• 2 squares chocolate
• 1 1/2 cups confectioners' sugar
• 1 teaspoon vanilla extract