Preheat the oven to 350 F.
Gently clean the mushroom caps with a kitchen towel. Remove the stems, chop them finely and set them aside.
Toss the mushroom caps in the melted butter and place them on a baking dish, gill sides up.
Prepare the stuffing by mixing the chopped mushroom stems, garlic, onions, cilantro, crushed red pepper, black pepper, lemon juice, 2 tbsp of bread crumbs, and 2 tbsp of cheese, and salt.
Spoon the stuffing in the mushroom caps and top with the remaining bread crumbs and cheese.
Bake until the cheese is melted and the topping turns golden brown, about 30 minutes. Serve warm.