Clean mushrooms and preheat oven to 350.

Break off stems of mushrooms. Discard unedible parts, chop rest extremely fine.

Heat oil in large skillet over medium heat. Add garlic and chopped mushrooms. When cooked through, set aside to cool.

Add cream cheese, grated Parmesan cheese, black pepper, onion powder, and ground cayenne pepper.

Spoon mixture into mushrooms.

Bake 20 minutes