Zucchini Brownies

Ingredients

• 2 cups all-purpose flour
• ½ cup unsweetened cocoa powder
• 1 ½ teaspoons baking soda
• 1 teaspoon salt
• ½ cup vegetable oil
• 1 ½ cups granulated sugar
• 2 teaspoons vanilla extract
• 2 cups shredded zucchini (1 large or 2 small zucchinis)
• 3-5 tablespoons water
• ½ cup chopped walnuts (optional)
• 3 tablespoons unsweetened cocoa powder
• ¼ cup unsalted butter (melted)
• 2 cups powdered sugar
• ¼ cup milk
• 1 teaspoon vanilla extract
• Pinch of salt