-Rinse and de-stem mushrooms.
-Brush inside of the mushrooms with a thin coat of pesto. You can use a pastry brush, paper towel or a fork/spoon to do this.
-Stuff mushrooms with crumbled feta.
-Turn on broiler.
-Place mushrooms in broiler proof baking dish.
-Sprinkle mozzarella over mushrooms.
-Broil mushrooms until the mozzarella has melted.
-Use firm tofu in place of feta and soy cheese in place of mozzarella.
-Mince fresh basil leaves and mix with feta. Omit pesto.
-Mix dried basil in with feta. Let sit for at least half hour before stuffing mushrooms. Omit pesto.
-Use portebella mushrooms instead of button