– 1 cup all-purpose flour – 1 teaspoon ground cinnamon – 1 teaspoon baking soda – 1/2 teaspoon salt – 2/3 cup vegetable oil *see notes – 1/3 cup granulated sugar – 1 cup light brown sugar packed – 2 large eggs – 2 teaspoons vanilla extract – 2 cups old fashioned rolled oats (*see notes) – 1 1/2 cups mix-ins like raisins, cranberries, chocolate chips, nuts or a combination (optional)