Start by seasoning your chicken breasts with salt and pepper, then dredge them in flour. Shake off the excess.
Heat the olive oil in a large skillet over medium heat. Once shimmering, add your chicken and cook until golden brown on both sides, about 3-4 minutes per side. After cooking, set aside the chicken on a plate.
In the same skillet, melt the butter. Add your mushrooms and cook, stirring occasionally until they're tender and slightly golden, about 5 minutes.
Pour in the Marsala wine, scrapping the bottom of the pan to release any browned bits. These bits are packed with flavor, don't miss out!
Add the chicken broth, bring the mixture to a simmer and let it cook for about 10 minutes, or until the sauce has reduced by half.
Return the chicken to the pan, nestling it into the sauce. Let everything simmer together for about 5 minutes, or until the chicken is cooked through.
To serve, place the chicken on a plate, and pour a generous amount of the Marsala and mushroom sauce on top. Sprinkle with chopped parsley for a pop of color and freshness.