Preheat oven to 400 degrees and have one 8 x 8 baking dish or four small ramekins ready to use.
In a medium bowl, toss scallops with melted butter, lemon juice, garlic, salt and cayenne. Divide mixture evenly between ramekins or place in baking dish.
In a small bowl, mix together panko, parmesan and olive oil. Sprinkle mixture evenly on top of scallops. Bake until bubbly and scallops are cooked through, about 20 minutes. Garnish with scallions or parsley to serve.
1/2 cup panko bread crumbs, 1/4 cup parmesan cheese, 1 tablespoon extra virgin olive oil, minced scallions or parsley