Mushroom Grilled Cheese Sandwich
Ingredients: – 1 tablespoon butter– 1 tablespoon olive oil– 1 small onion, sliced– 8 ounces cremini mushrooms, sliced– 2 cloves garlic, chopped– 1 teaspoon thyme, chopped– 1/4 cup white wine or broth– salt and pepper to taste– 1 tablespoon parsley, chopped– 1/2 teaspoon truffle oil (optional)– 1 cup fontina or gruyere, shredded– 1/4 cup parmigiano…