Cook pasta according to package directions reserving 1 cup of the pasta water
Meanwhile salt, pepper and coat scallops lightly with flour
Heat oil and butter to medium high
Saute scallops until golden about 3 minutes per side
Remove scallops set aside
In the same pan saute the onion and garlic until tender and just beginning to brown
De glaze pan with chicken stock or white wine
Add heavy whipping cream, resevered pasta water and marinara sauce
Simmer until sauce thickens about 10 minutes
Add spinach, , and herbs last 5 minutes
Add Scallops just to heat through
Drain pasta toss in sauce
Top with seared scallops, parmesan and chopped Italian parsley