2 sticks of unsalted butter, room temperature (or you can
microwave then for 25 seconds to soften up) 2 eggs plus 1 egg yolk 1 cup brown sugar, firmly packed 3/4 cup granulated sugar 3/4 teaspoon salt 3/4 teaspoon baking soda 1 cup milk
chocolate chips 1 cup
dark chocolate chips (or you can just use two cups of milk
chocolate chips) 1 1/2 cup
chopped Kit Kat bars 3 cups of all purpose flour