Nougat is an important ingredient in the 3 Musketeers Bar, as well as in many other candy bars created by Mars. Nougat is made by mixing a hot sugar syrup with whipped egg whites until the solution cools and stiffens, creating a frappe. Other ingredients may be added to the nougat during this process to give it different flavors. In this recipe, you'll add chocolate chips to create a dark, chocolaty nougat.