To make the bechemel, melt butter on low heat and add flour. Mix well to combine. Add nutmeg, cayenne, salt, pepper, and bay leaf. Stir until thickened.
Mix cheese into bechamel and stir thoroughly until all cheese is melted. Add shrimp and crab. Combine pasta and sauce in baking pan. Dust with parmesan and bake at 350 til sauce is bubbling and slightly browned on top.
Notes
It's best to make this with the little bay shrimp, but regular shrimp is fine, too. You could also add lobster or use real crab depending on your budget.
Scan for full nutrition info and step-by-step photos.