Pat scallops thoroughly dry all over with paper towels. (If necessary, remove the small side muscle from the scallops.) Season them with salt and pepper.

Heat a large skillet over high heat. Add oil and butter. Once hot, add the scallops, spacing them apart so they're not touching. The oil in the pan should be hot enough that the scallops gently sizzle when added.

Cook for 2 minutes (without touching them), until a golden crust forms on the bottom. Reduce heat to medium high. Gently flip to the other side and cook for another 1-2 minutes, until golden on bottom and translucent/opaque on the sides.

Scallops cook very quickly, usually in less than 5 minutes, so use the touch test to check for doneness; if they're done; they should feel firm, with a little bit of bounce. Err on the side of undercooking them, as you can always add them back the pan to cook longer, if needed. Keep in mind they will continue to cook a little as they rest.