01 - Place chicken breasts between sheets of parchment paper and gently pound to a uniform ½-inch thickness using a meat mallet or rolling pin.
02 - In a shallow bowl, combine flour, salt, and pepper. Dredge each chicken breast in the seasoned flour, shaking off any excess coating.
03 - Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Cook the chicken for 4 to 5 minutes per side until golden brown and cooked through. Transfer to a plate and cover loosely with foil.
04 - Add the remaining tablespoon of olive oil to the skillet. Sauté the mushrooms for 4 to 5 minutes until deeply browned. Stir in the minced garlic and cook for 30 seconds until fragrant.
05 - Pour in the Marsala wine, scraping up any browned bits from the bottom of the pan. Let the liquid reduce by half, about 2 to 3 minutes.
06 - Add the chicken broth to the skillet and bring to a simmer. Cook for 3 to 4 minutes, allowing the flavors to meld together.
07 - Return the chicken breasts to the skillet, spooning the mushroom sauce over the top. Simmer gently for 3 to 5 minutes until the chicken is heated through and the sauce has thickened slightly.
08 - Sprinkle with chopped fresh parsley and serve immediately while hot.