Spicy stuffed mushrooms are always a party favorite, and these are yummy. But do remember to keep an eye on them; burnt mushrooms are not so yummy.
Select similar-sized mushrooms. Remove stems. Saute sausage well, breaking into small bits. Cool. Add rest of ingredients, except olive oil. Work mixture with hands until well blended. Fill mushroom caps. Just before baking, drizzle with olive oil. Cover with aluminum foil and bake at 400 degrees F for 10 minutes (add another 5 to 10 minutes for larger mushrooms). Remove foil and bake 10 more minutes or until they are nicely browned.