Zucchini Chocolate Chip Muffins

Bahan-bahan (12 porsi)

• 1¾ cups all purpose flour
• 1 teaspoon ground cinnamon
• 3/4 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 2 large eggs
• 1 cup granulated white sugar
• 1/2 cup canola or vegetable oil
• 1 teaspoon vanilla extract
• 1 cup finely shredded zucchini
• 1 cup semi sweet chocolate chips
• 3/4 cup coarsely chopped walnuts ((optional))