Portabello Mushroom Burgers Prep time: 10 mins Cook time: 20 mins Total time: 30 mins Serves: 4 burgers Ingredients 8 medium portabello mushroom caps olive oil 1 1/2 teaspoon salt fresh ground pepper 1 pound ground beef 4 slices cheddar cheese burger toppings of your choice sesame seeds for garnish Instructions Pre-heat oven to 450