Gather your ingredients. Clean the mushrooms. Set your oven for 400 degrees.
Remove the stems and chop them up.
Melt the butter over low heat. Cook the chopped stems in the butter with garlic. Adjust the heat as needed…. just don't burn the butter.
Add the crumbs to the stems. Add some salt & pepper to your liking.
Continue to cook until the stems have reached a color and texture of your liking.
Combine the stems with all of the other ingredients in a large bowl.
Mix well (I use my hands for this).
Stuff the shrooms and place them on a baking sheet or dish. Sprinkle with Parmesan if you'd like.
Bake for about 20-30 minutes until the tops of the mushrooms are nicely browned.
Serve & Enjoy!