Boil the pasta in salted water until it’s firm to the bite. Reserve 1/4 cup pasta water, then drain.
Pat scallops dry with a paper towel. Season with salt and pepper.
Warm olive oil and butter in a pan over medium-high heat. Sear scallops 1.5–2 minutes per side until golden. Remove and set aside.
Using the same pan, cook the garlic for about 30 seconds. Add cream and simmer for 2–3 minutes.
Stir in truffle oil and Parmesan. Mix until smooth. Adjust thickness with pasta water if needed.
Add cooked pasta and toss until coated. Return scallops to the pan just to warm.
Serve immediately, garnished with parsley, lemon zest, or extra cheese if desired.