Directions

1. Remove stems from mushrooms. Slice the rough bottom part of the mushroom stems off and discard. Chop your stems; measure out 1/3 cup and reserve. Discard any remaining pieces.
2. In your mixing bowl, combine the cream cheese, mayonnaise and Parmesan cheese and mix until incorporated. Season with a bit of salt and a bit more pepper, add in the onion, bacon and chopped mushroom stems and stir until combined. (This can be made a few hours in advance and refrigerated). Season the insides of your mushrooms lightly, place them on a very lightly oiled baking sheet. Preheat the oven to 375°F.
3. Stuff mushrooms with the onion mixture and bake for 12-15 minutes or until mushrooms are done to your liking (cook time will vary based on size of mushrooms used).