Preheat oven to 350°F and line two baking sheets with parchment paper.
In a large bowl, cream together the butter, brown sugar, and granulated sugar until light and fluffy.
Beat in the eggs and vanilla extract until combined.
In a separate bowl, whisk together the flour, baking soda, salt, and cinnamon.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
Stir in the oats and chocolate chips until evenly distributed.
Scoop dough onto prepared baking sheets using a tablespoon or cookie scoop.
Bake for 10–12 minutes, until edges are lightly golden and centers are set.
Let cool on the baking sheet for 5 minutes before transferring to a wire rack.