<human>:  What are the ingredients needed to make zucchini muffins?
<bot>: The ingredients needed to make zucchini muffins are: 2 cups all-purpose flour, 1/2 teaspoon baking soda, 1 teaspoon baking powder, 1 teaspoon ground cinnamon, 1/4 teaspoon salt, 1/3 cup vegetable oil, 3/4 cup brown sugar, 2 large eggs, 1 teaspoon vanilla extract, 1 and 1/2 cups shredded zucchini, and 1/2 cup chopped walnuts (optional).