In a large bowl, beat the butter and sugars for a minute or two, until fluffy; add the eggs and vanilla and beat again. Add the flour and salt and beat until almost combined; add half the chocolate chips and beat on low speed or stir just until blended.
Shape the dough into large marble-sized balls and place them on an ungreased baking sheet, then refrigerate or freeze until firm.
Melt the rest of the chocolate chips in a bowl in the microwave, or a small pot over low heat on the stovetop (careful it doesn't burn!) - dip the balls of dough, using a fork if you want to coat them completely. Set them on a sheet of parchment or foil and let sit (or refrigerate) until firm.