Preheat oven to 350° Fahrenheit.
Cream the butter and brown sugar together until well mixed. Scrape down the sides of the bowl with a rubber spatula.
Mix in the egg and vanilla until all incorporated.
Mix in the baking soda, salt, and flour just until all incorporated.
Stir in the chocolate chips.
Drop rounded tablespoons of cookie dough about 2 inches apart onto an ungreased sheet pan.
Bake for 8--10 minutes. Let sit on the pan for a couple of minutes before removing.