How to make
In separate containers, mix the mince with oil, cheese with oil, feta with oil. Salt them.
Dip the mushrooms in hot water for a few min. until they soften.
Once they do, put them in a suitable baking container. Remove the stems if you haven't already, pour 1 type of mixture into each mushroom.
Bake at 360°F (180 °C) until crispy.