•220g rolled oats •170g unsalted butter, room temperature •110g all-purpose flour •185g packed brown sugar •1 egg •1/2 teaspoon baking soda •1/4 teaspoon salt •1 teaspoon vanilla extract •150g semisweet chocolate chips (milk or white) •1 teaspoon cinnamon (optional) •chopped nuts or raisins (optional) Preheat oven to 350°F (177 °C). In a large bowl, beat the butter and brown sugar with an electric or hand mixer until smooth and creamy. Next, add the egg and vanilla extract, and continue beating until the mixture is light and well combined. Take another bowl and mix oats, flour, baking soda, and salt. Add this mixture to the butter-sugar-egg mixture and use a wooden spoon to stir well. Stir in chocolate chips (milk or white). You can also add some chopped nuts or raisins. Prepare a baking sheet and place cookies onto it. Roll tablespoonfuls of the dough into balls and place them on cookie sheets about 5cm apart. Then, slightly flatten the cookies with damp fingers so they have about 1.25cm thickness. Bake them for about 10 to 15 minutes until they have gorgeously golden brown edges. Remove cookies from the oven, set aside and allow them to cool on baking sheet for a few minutes. Next, transfer cookies to a wire rack