Add mushrooms. Knead together butter and flour. Pinch into two pieces; whisk into boiling mixture. Reduce heat to a simmer. Stir in Marsala, then add chicken. Let simmer for 3 to 5 minutes.
Rotisserie Chicken Marsala is the latest menu addition at Boston Market. It's "a delicious spin on a classic Italian dish — with sautéed cremini and portobello mushrooms, garlic, fresh herbs ...