Chorizo Stuffed Mushrooms

Name: Chorizo Stuffed Mushrooms
Ingredients: 24 large white button or cremini mushrooms, wiped clean with a damp towel or brush; 6 tablespoon plus 1 teaspoon extra virgin olive oil, divided; 6 tablespoon (3⁄4 stick) butter, plus extra melted butter for basting; 3 ⁄4 cup finely chopped onions; 2 tablespoon minced garlic; 1 ⁄2 cup minced serrano ham; 1 ⁄2 cup chopped dry-cured chorizo sausage; 1 ⁄4 cup chopped fresh parsley, thyme or marjoram; 1 ⁄2 cup toasted breadcrumbs; 1 ⁄8 teaspoon freshly ground black pepper; 2 tablespoon grated manchego or parmesan