Remove stems from mushrooms. Chop stems.
In pan, sauté garlic and parsley in butter and oil for 5 minutes.
Mix in stems, bread crumbs, Parmesan cheese, salt, and pepper.
Stuff mushroom caps with the mixture.
Preheat oven to 350°.
Arrange stuffed mushrooms in well-oiled baking pan.
Bake for 20 minutes.
