Prepare a pot with salted boiling water and cook pasta according to package directions. Reserve about 1 cup of pasta water just in case you need it to thin the sauce.
Prepare your scallops using the tips from the post (pat them dry and don't sprinkle with salt and pepper till immediately before searing). Heat a large pan, I prefer non-stick or cast iron, with butter and oil over medium high heat. Once hot, add the dry, seasoned scallops and don't crowd them or mess with them! If they don't make a sizzle sound, your pan isn't hot enough. Leave them to sear for 2 minutes, or until a nice brown crust forms. Flip and cook another 2-2½ minutes or until you get the same crust on the opposite side. Set the scallops on a warm plate and cover with foil.
In the same pan, use the leftover butter/oil to saute the chopped shallot and garlic, about 2 minutes until softened and fragrant. If your pan is dry, use 1 tablespoon more butter or oil. Deglaze the pan by adding broth, scraping up any browned bits (this basically means add broth to a hot pan which should bubble up and start to simmer). Then add cream and bring to a simmer for about 3-4 minutes until the sauce has thickened (it will still be fairly thin, that's ok, it will thicken once the pasta is added).
Add your cooked pasta and toss with the sauce, simmering to thicken it a bit more. If your sauce is too thick or isn't coating the pasta well, add in ¼ cup of the reserved pasta water till it reaches your desired consistency. Add in fresh chopped parsley and kosher salt and pepper to taste. Top with the cooked scallops.