Prepare the spaghetti to package directions. Reserve one cup of the cooking water, then drain. Toss with some olive oil.
In a 12 inch cast iron skillet, heat the oil over medium heat, add the shallot. Cook a few minutes until the shallot is softened and fragrant.
Add the wine and cream, cook until mostly reduced 2-3 minutes.
Add the brie cheese spread, mustard, Prosciutto, spaghetti and 1/2 cup of the reserved cooking water. Fold in the parsley.
Continue to cook and toss until the pasta is fully coated in the sauce, add more cooking water if needed to thin out the sauce and to loosen up the spaghetti so it doesn't stick.
Season with some pepper. Serve immediately topping with green onion.
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