Preheat your oven to 350°F (175°C).
In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until smooth.
Add the egg and vanilla extract, mixing until well combined.
In a separate bowl, combine the rolled oats, flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just blended.
Fold in the chocolate chips until evenly distributed.
Drop spoonfuls of dough onto a greased baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes, or until the edges are golden.
Remove from the oven and let cool on the baking sheet for a few minutes.
Transfer cookies to a wire rack to cool completely.