first you can use your normal button mushrooms,stem out and carved open,but i like to go all out and use a large portabella can be a whole meal or slice like a pie!!
ingediants//half cup fine italian bread crumbs
half very finely chopped onion
i stalk finely chopped celery
half fine chopped apple
half cup fine chopped mushroom of choice
6-8 medium size shrimp,boiled fine chop
since we are here i 10 inch,brook trout fried bones removed and chopped
1 tsp old bay seasoning,,half teaspoon course black peppar,quarter cup chicken broth
now mix all together,adding more bread crumbs as needed for consistency.stuff caps or spread over large portabella.top with little squares of strong cheese of your liking and parmesion.
bake at375 for approx 15-20 minutes enjoy