– 1 & 1/2 cups (180g) all-purpose flour – 1 teaspoon baking powder – 1/2 teaspoon salt – 1/4 teaspoon ground cinnamon – 1 & 1/2 cups (148g) old-fashioned rolled oat – 1/2 cup (113g) unsalted butter, softened – 1/2 cup (100g) firmly packed light brown sugar – 1/4 cup (50g) granulated sugar – 1 large egg – 1 teaspoon vanilla extract – 1 & 1/2 cups shredded zucchini (about 1 medium zucchini)* – 1 & 1/2 cups (255g) semisweet chocolate chip – 1/2 cup chopped nuts, such as pecans or walnut