Decadent Chocolate Zucchini Cake

Ingredients

• 2 cups all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup vegetable oil
• 1 1/2 cups white sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 2 cups grated zucchini
• 1/2 cup chopped walnuts (optional)
• 1/2 cup chocolate chips