In a large saucepan, saute onions, green pepper and mushrooms in butter. Add flour, a little at a time, and blended together well.
Removed from heat, add egg yolk, Worcestershire sauce, mushroom soup, cream-of-shrimp soup and 1/2 of the grated cheese. Mix well.
Add seafood and seasonings. Pour into a large casserole dish and top with remainder of the grated cheese and seasoned broad crumbs. Bake at 350 degrees Fahrenheit for 40 minutes.
Serve with corn-on-the-cob and French bread.
Casseroles - Quiches
Cajun Country -- New Iberia, Louisiana