Preheat oven for French fries. When ready put in oven and set timer.
Mix ground meat with egg, cornstarch, bread crumbs, and seasonings. Form into patties.
Cook patties on skillet with small amount oil, being sure not to overcrowd the pan. Check for doneness. Add cheese on top if desired.
Toast buns. Have other toppings prepared if desired. Top burger with guacamole and serve with sweet potato fries.