I made the following subs for a healthier cookie: used whole wheat flour, replaced half the butter with ground flax seed and used all 60 % cocoa chocolate chips. (myrecipes.com)
Buy 80 % cocoa chocolate bars and break into good - sized pieces. (parentingsquad.com)
I used 90 % cocoa chocolate for this recipe, but if you're looking for something sweeter and lighter you could totally try a chocolate closer to 70 %. (spiceandsprout.com)