Melted butter helps to make a chewy more dense style cookie (rather than creamed butter and sugar) recipes. You can bake the cookies after mixing, but if you have the time, I strongly suggest chilling the dough balls in the refrigerator for as long as you can. (2 hours to 2 days!) It really deepens the flavor and improves the texture. I like to chill the dough balls rather than the whole batch of cookie dough. As the dough is easier to scoop when it's soft and the dough balls don't take as...