You may not be familiar with gochujang, but if you appreciate spicy, sweet and umami flavors, add it to your shopping list immediately! You can find it in the international aisle of most large supermarkets or in any Asian grocery. This fermented chili paste is the key ingredient in Korean fried chicken. It’s also the basis of the marinade for this sheet-pan style meal. Spice levels of gochujang can vary between brands, so if your jar is packing the heat, leave out the optional red pepper flakes for the chicken. The sweet potato chunks that roast along with the chicken have perfectly soft, edible skin so there’s no need to peel them unless you really feel like it.