Fill each clean clam shell with the mixture, pressing tightly into the shell. Arrange on a baking sheet, and sprinkle lightly with paprika. (Stuffed shells may be covered and frozen at this point for later use.) Bake in the preheated oven for 20 minutes, or until golden brown and sizzling. If frozen, bake at 350 degrees F for 30 minutes, or until warmed through.