When i think of the perfect appetizer i immediately think of stuffed mushrooms. i am a mushroom lover the filling options for your stuffed mushrooms are endless, but this combination is one that isn't to be missed. the sausage along with the cheesy-ness makes for a delicious and rich appetizer your guest will love. these are very similar to my other stuffed mushrooms recipe, but by broiling the mushroom caps in this recipe with melted butter, this version i would call 2. 0. panko crusted sausage stuffed mushrooms 1 pkg. mushrooms1 tbsp. melted butter1 lb. italian sausage1 med. onion (diced)3-4 garlic.