Using a mixer, cream together butter, vanilla, brown sugar, and granulated sugar.
Add eggs, one at a time, scraping bowl between each addition.
In a separate bowl, combine flour, oats, cinnamon, and baking soda. Gradually add this mixture to your wet ingredients, mixing on medium speed until just combined.
Add in your chocolate chips, again mixing until just combined.
Scoop dough with a tablespoon and roll into balls. Place balls in the refrigerator for 1-2 hours, until they become firm.
Move oven rack to highest position and preheat oven to 350 degrees F. Bake cookies for 10-11 minutes.
If using an Airbake pan, allow cookies to cool on pan before removing. If using a single-layer cookie sheet, remove cookies promptly and allow to cool on wax paper or a wire rack.