Preheat oven to 350°F and prep a cookie sheet with parchment paper. Microwave the butter to just barely melt it, about 30 to 40 seconds.
Beat butter, sugar, and brown sugar together. Add vanilla and egg. Then mix in flour, baking soda, and salt. The dough should be between wet and dry in texture. Fold in the amount of chocolate chips to your liking, I usually do around half a bag or so.
Form into balls and place on the cookie sheet a couple inches apart. You should have enough to make about 10 decent sized cookies. Bake for 9-11 minutes. Do not overbake! Let cool a few minutes on the cookie sheet before moving to a plate and enjoy.