Chicken Marsala

Name: Chicken Marsala
Cuisine: European, Italian, Mediterranean
Ingredients: 4 boneless, skinless chicken breasts ((about 1 1/2 pound, 680g), cut in half crosswise); salt; freshly ground black pepper; 8 to 10 ounces (230-280g) button mushrooms, (stems trimmed and sliced); 3 tablespoons (total) olive oil; 4 tablespoons (total) unsalted butter; 2 large cloves garlic, (peeled and minced); about 1/3 cup (50g) flour; 1/3 cup (80ml) chicken stock or water (80ml); 1 teaspoon corn starch; 2/3 cup (160ml) Marsala wine (preferably dry); 1 1/2 teaspoons balsamic vinegar; 2 tablespoons chopped parsley