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 reggiano, grated
4 slices bread
2 tablespoon butter
View the full recipe: Closet Cooking
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