Beat your room temperature butter and sugars together. When combined, add an egg one at a time until fully incorporated. Mix your butter, sugar, and eggs on medium-high speed for 3 minutes until light and fluffy.
Add in vanilla, flour, baking soda, salt, and cinnamon. Mix until just combined. Fold in oatmeal and raisins.
Scoop onto a lined cookie sheet, leaving about 2" between each cookie. Bake for 8-12 minutes. They are done when the edges are golden and the center is no longer tacky. Let cool completely to get the most chewiness!