Preheat your oven to 350°F (175°C).
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy.
Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.
In a separate bowl, combine the all-purpose flour, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Fold in the rolled oats until evenly distributed throughout the dough.
Drop spoonfuls of the cookie dough onto a baking sheet lined with parchment paper, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown.
Remove from the oven and let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
