Good-Cooking - Chocolate Zucchini Rum Cake

Ingredients

• 1 cup butter, at room temperature
• 2 cups granulated sugar
• 3 large eggs
• 2 cups shredded, unpeeled zucchini
• 1/3 cup rum or brandy or water
• 2 1/2 cups all-purpose flour
• 1 cup chopped walnuts
• 1 cup semisweet chocolate bits
• 1/2 cup cocoa powder
• 2 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 3/4 teaspoon cinnamon
• 1 teaspoon salt
• 1/4 cup milk
• 1 2/3 cup confectioners sugar' sugar
• 3 tablespoons rum