Remove the stem from the mushrooms, clean them and set aside. In a frying pan with a bit of olive oil, lightly sauté the Welsh onions and mushroom stems, previously sliced.
Once browned, add small chunks of Consorcio serrano and stir in the pan.
Use this mixture to stuff the mushroom heads, and place them in a baking dish.
Add salt and pepper and pour olive oil over them. Place in the oven for 10 minutes at 170º C.
Other vegetables can be used, such as green or red pepper, zucchini, asparagus, etc.