Done that variation too. Stuff with crabcake type mixture.
Crabcake (for four HUGE crabcakes):
coconut flour 1c
rotel- 1 small can with juices, or peppers, onions, and tomatos
1 lb crab (well, when weighed shell on) (I don't know about Krab, I despise the stuff)
enough water to turn it into a globby mess
Mix well and create said globby mess. Bake at 350* until done (your preference on how doughy you like your cakes is the catch here.)
For the shroom caps, stuff each cap with crabcake mix and wrap with bacon. Grill.