For a while, I only added one kind of chocolate but recently I started mixing things up and started adding 3 kinds of chocolate plus candied cocoa nibs to my dough. Because there is no such thing as too much chocolate. The cocoa nibs are candied but you can skip this step if you like.
Make sure to also check out my Small Batch Chocolate Chip Cookie Recipe which is made with melted butter and requires no chill time.