Zucchini Brownies

Name: Zucchini Brownies
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 2 cups (248g) all-purpose flour; ½ cup (40g) unsweetened cocoa powder; 1 ½ teaspoons baking soda; 1 teaspoon salt; ½ cup (118g) vegetable oil; 1 ½ cups (300g) granulated sugar; 2 teaspoons vanilla extract; 2 cups shredded zucchini (1 large or 2 small zucchinis); 3-5 tablespoons (15-75ml) water; ½ cup chopped walnuts (optional); 3 tablespoons (15g) unsweetened cocoa powder; ¼ cup (59ml) unsalted butter (melted); 2 cups powdered sugar; ¼ cup (59ml) milk; 1 teaspoon vanilla extract; Pinch of salt