I never would have thought cream cheese, but I tried this and now it's the only way I do my mushrooms.
12 to 20 stuffing size mushrooms(depending on size)
1 8oz pack cream cheese
1/4 cup grated parmesan cheese
1/4 tsp onion powder
1/4 tsp black pepper
1/4 tsp cayenne powder
1 clove garlic
1 tbsp olive oil or butter
Dice the stems up and reduce in pan & olive oil. Lower heat & add smashed clove of garlic & simmer a minute or 2 to let garlic flavor the stems. Take out and let cool down to room temp or colder. Let cream cheese get to room temp.
Add all ingredients together and stuff mushooms. You can pile it high on the shrooms if you have to 'cause durring baking the mixture stays put & dosn't drip. Bake at 350f for about 20 minutes on shallow baking pan, but keep an eye on them-you want them out just about when you see a bit of moisture comming out the bottom of the shroom.
Serve them up with a perfectly broiled steak.