Yes, Jeffrey. I don't think we had any cheese in the filling at all. What we did was make a nice bechamel to top them, once they are baked off, and then, a light sprinkle of freshly shredded Parmesan.
Roughly, from memory... would chop up raw shrimp (nasty mess), sautee the shrimp with a fine minced green & red bell peppers and onions, with a tad of minced garlic, in butter. Once the shrimp was cooked, and the onions and peppers close to done, toss in the lump crab meat. Heat it through. Then, would hit it with a little splash of white wine, and let it reduce off. Then, added heavy cream, a little cayenne pepper, and heated it up to a simmer, until it reduced and thickened. Then, we would toss in bread crumbs to a good texture. We steamed off our mushroom caps a little bit just to help it along. Fill them all. Would heat them in an gratin dish in the oven, hit it with the bechamel, and the sprinkle of Parm, and a garnish of parsley sprig or a couple chive shoots.
Wow, can't remember I still remember all that!!!