Place pat of butter over oysters. Spoon roughly half a teaspoon of chopped garlic in each slot. Top with roughly one teaspoon of chopped parsley over garlic. Sprinkle parmesan cheese as desired over each oyster. Place a pinch of cayenne pepper in each slot to finish.
Broil muffin tin for 3-4 minutes, until juices are bubbling and the cheese is golden-brown on top. Serve individually or on French bread.