Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a mixing bowl, cream together the butter, brown sugar, and granulated sugar until light and fluffy.
Add the egg and vanilla extract, and mix until well combined.
In a separate bowl, whisk together the flour, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Stir in the oats and chocolate chips until evenly distributed.
Using a cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheet.
Bake for 10-12 minutes, or until the edges are golden brown.
Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.
Enjoy your delicious Chocolate Chip Oatmeal Cookies with a glass of milk or your favorite hot beverage!
