There are many ways to cook a mushroom burger. However, grilling will produce the best results. The reason is that grilled mushrooms have more flavor than other cooking options like sauteing or pan-frying. Grilled mushrooms also cook faster than many other types of food. Some people prefer pan-fried mushrooms because it's a good way to add an extra layer of crispy texture. Pan-frying is also the only way to make stuffed mushroom burgers like Portobello burgers or Swiss mushroom burgers. This cooking method creates a crunchy texture on the outside while keeping the inside soft and juicy.