Generously season the chicken on both sides with salt and pepper. Add the flour to a shallow bowl and dredge the chicken cutlets until coated. Set aside on a plate.
Place a large skillet over medium-high heat, and add the olive oil. Once hot, add the chicken to the skillet and cook on each side for about 3 minutes until cooked through. Remove the chicken from the skillet and set aside.
To the same skillet, add the shallots and cook for about 3 minutes or until slightly translucent. Add the mushrooms and sauté for 3 more minutes. Add the garlic, and cook for 1 more minute. Remove all the veggies from the skillet and set aside in a bowl.
To the hot skillet add the butter and let melt. Add the flour and mix until a paste forms. Cook the roux for 1 minute stirring constantly. Slowly whisk in the Marsala wine until there are no lumps, and bring to a simmer.
As soon as the sauce thickens, add the chicken broth, and stir until slightly thickened. Add the mushroom mixture back to the pan along with the chicken breasts. Use a spoon to coat the chicken with the sauce until warmed through.
Remove from the heat and serve warm with marsala sauce spooned over the chicken.
Video
Notes
You can buy thin-cut chicken breasts from the store. Or you can purchase standard boneless, skinless chicken breastsand slice them in half horizontally to create thin-cut breasts. I usually buy whichever is cheaper.