Using a sharp knife, slice each chicken breast in half, width-wise.
Season each chicken cutlet with salt and pepper on both sides. Spread flour in a wide, shallow bowl and dip chicken into the flour on all sides. Gently shake off excess flour.
Preheat a large cooking pan over medium to medium-high heat and add butter. Once butter is melted, add battered chicken to the pan and sear for a few minutes on each side, until chicken is almost done.
Take chicken out of the pan and set it aside. Lower the heat to medium.
Melt butter in the same pan and add mushrooms. Saute mushrooms until softened and pour in Marsala wine.
Let wine simmer for a few minutes and add chicken broth, marjoram, salt, and pepper. Stir and let it simmer for a couple more minutes.
In a small cup, mix cornstarch with a splash of cold chicken broth and pour it into the sauce, while stirring. Stir until the mixture thickens and add chicken back into the pan.
Sprinkle diced green onion over the top and cook for just a few minutes, until chicken is fully cooked.
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Notes
Need more sauce? Feel free to double the sauce recipe to make more sauce. It's great to double it if you're planning of serving this dish with pasta.
Gluten free: Chicken Marsala is very easy to make gluten free and no one will even notice the difference. You should substitute flour for gluten free all purpose flour when battering the chicken. The sauce is thickened with cornstarch so it is already gluten free.
Marsala wine tip: Marsala wine is a sweet sipping wine that’s usually made with addition of Brandy. It’s not as sweet as Sherry or Port and that’s why it’s perfect for cooking. This wine adds great deep flavor to the sauce, the chicken, and mushroom. If you have to avoid alcohol completely, use non-alcoholic, cooking Marsala wine but note that the flavor will not be the same.
Need non-alcoholic version? If you’re worried about alcohol, note that most of the alcohol evaporates during the cooking process but not all of it. So if you’re trying to avoid alcohol completely for various reasons, then you will want to use non-alcoholic Marsala cooking wine.