Chocolate Zucchini Sheet Cake Recipe - Six Sisters' Stuff

Ingredients

• 2 cups sugar
• 1 cup plain greek yogurt
• 3 eggs
• 2 ½ cups all-purpose flour
• ¼ cup cocoa powder
• 1 teaspoon baking soda
• ¼ teaspoon baking powder
• ¼ teaspoon salt
• ½ cup milk
• 2 cups shredded fresh zucchini
• 1 Tablespoon vanilla extract
• ½ cup butter (or margarine)
• 2 Tablespoons cocoa powder
• ¼ cup milk
• 3 ½ cups powdered sugar
• 1 teaspoon vanilla