In a large skillet, heat up the oil and butter over medium to medium-high heat. Sear the scallops, shrimp, and squid, about 1 minute per side. Remove from the pan and set aside. Turn the heat to medium and add the garlic and pepper flakes. Cook until soft, but not brown. Add the tomato sauce and cream and season to taste. Return the scallops and shrimp to the pan and simmer gently on low while the pasta is cooking.
Cook the pasta according to the package. Drain and toss with the sauce and seafood. Enjoy immediately with a sprinkling of flat-leaf parsley.
