Preheat the oven to 350°F.

Clean the mushrooms, separate and finely chop the stems. Place 2 tablespoons of the olive oil in a large pan over medium heat, add the chopped mushroom stems, salami, garlic and onion. Sauté for 5 to 6 minutes, stirring frequently, until the vegetables are soft and fragrant.

Add the butter, allow it to melt and mix well before adding the lemon juice and breadcrumbs. Combine thoroughly and add the crushed red pepper, salt and freshly ground pepper to taste. Mix in the parsley and parmesan cheese. If the mixture seems too dry, drizzle in a bit more olive oil.

Spray a baking pan large enough to hold the mushroom caps in a single layer with nonstick spray. Arrange the caps, bottoms up, sprinkle them with salt and pepper and drizzle with the remaining 1 tablespoon of olive oil. Using a small spoon, fill each cap with a bit of the breadcrumb mixture, packing tightly. Sprinkle the shredded mozzarella over the tops and bake for about 15 minutes, or until the mushroom caps are tender.

Transfer to a platter and serve immediately. You can spear each with a toothpick if desired.