Wash & de-stem the mushrooms but reserve the mushroom stems
Take 1 tbs of the vegan butter & coat the bottom of a 9" X 13" baking pan
Arrange the mushrooms in the pan
Combine the parsley, celery, garlic & onion with the reserved mushroom stems in a food processor & process until everything is shredded like hash
Cook the vegan sausage over high heat until it is browned then add the chopped veggies with the sage & thyme and cook for about 5 minutes
transfer everything to a large mixing bowl & add the bread crumbs & the ¼ cup of Parmesan cheese along with the salt & pepper & mix well
Add the vegan cream cheese & fold in with a large spatula to distribute evenly
Fill the mushroom caps with the sausage mixture
Top each one with the remaining Parmesan cheese & the 1 Tbs remaining butter (each mushroom gets a tiny spot of vegan butter) Or just melt the butter and brush over the tops of each one
Bake in a preheated 350°F oven for 25 minutes
Video
Notes
Storage Mushrooms are best served hot out of the oven but can be made ahead of time and reheated Leftover mushrooms should be stored in the refrigerator for up to 3 days