01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a large bowl, beat softened butter, brown sugar, and granulated sugar until light and fluffy, about 2-3 minutes.
03 - Beat in eggs one at a time until fully incorporated, then mix in vanilla extract.
04 - In a separate bowl, whisk together flour, baking soda, cinnamon, and salt until well blended.
05 - Gradually add dry ingredients to wet mixture, mixing on low speed until just combined. Do not overmix.
06 - Stir in rolled oats and chocolate chips with a spatula until evenly distributed throughout dough.
07 - Drop heaping tablespoons of dough onto prepared baking sheets, spacing about 2 inches apart to allow for spreading.
08 - Bake for 10-12 minutes until edges are lightly golden and centers appear slightly soft and underbaked.
09 - Let cookies rest on baking sheets for 5 minutes to set, then transfer to wire rack to cool completely.