01 - Place chicken breasts between sheets of parchment paper and gently pound to an even ½-inch thickness using a meat mallet or rolling pin.
02 - In a shallow bowl, combine flour, salt, and pepper. Dredge each chicken breast lightly in the seasoned flour mixture, shaking off any excess.
03 - Heat 2 tablespoons olive oil in a large skillet over medium-high heat. Add chicken and cook 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 1 tablespoon olive oil to the skillet. Sauté mushrooms for 4 to 5 minutes until nicely browned. Add 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. Cook for 2 to 3 minutes until the liquid is reduced by half.
06 - Add the chicken broth to the skillet and simmer for 3 to 4 minutes, allowing the flavors to meld together.
07 - Return the chicken to the skillet, spooning the mushroom sauce over the top. Simmer for 3 to 5 minutes until the chicken is heated through and the sauce has thickened slightly.
08 - Garnish with freshly chopped parsley and serve hot.