Preheat oven to 400F.
In a saucepan, melt the vegan margarine. Add the minced garlic, crushed red pepper, chopped mushrooms and sauté for a couple of minutes. Next, add the panko bread crumbs and chopped parsley. Stir to combine. Salt to taste and set aside.
Carefully wash the mushrooms and remove the stem. Place on a baking tray. Fill them with the bread crumb stuffing. Sprinkle with a pinch of salt — Bake at 400F for 20 minutes, or until topping is golden brown.