This classic chicken Marsala starts with thin-cut chicken breast and golden cremini mushrooms — all in one skillet. The Marsala reduces to a sticky glaze before the cream goes in — that's the soul of the sauce.
To slice chicken scaloppine: Arrange 3 boneless, skinless chicken breasts halves sideways and slice them in half. With the knife blade parallel to the cutting surface, slice them in half again, making 4 scaloppine slices per chicken breast.
Generously sprinkle both sides of the chicken with salt and pepper. Spread ½ cup all-purpose flour on a large plate. Dredge the chicken in the flour to coat both sides, shaking off any excess. Transfer the floured chicken to a piece of parchment or wax paper as you go.
Place a large (preferably 12-inch) skillet over medium-high heat. Add one tablespoon each of the butter and olive oil. When the butter is melted and stops foaming, add 1 pound thick-sliced brown or white button mushrooms to the pan.
Cook in one layer without stirring until the mushrooms are golden brown on one side. Stir in ½ cup chopped shallot, 1-2 cloves finely chopped garlic, 2 teaspoons chopped fresh thyme and ¾ teaspoon salt. Cook 2-3 more minutes, stirring frequently, until the shallots are translucent. Transfer the mushrooms to a bowl.
Return the skillet to medium-high heat and add the remaining tablespoon of butter and olive oil. When the butter has melted, add the dredged chicken pieces to the pan. Cook about 5 minutes per side, until golden brown on both sides (they'll still be a undercooked at this point). Note: If you're pan isn't large enough to hold all the chicken without crowding, cook them in 2 batches.
Pour ½ cup dry Marsala wine into the pan — it should begin to boil instantly. Cook until the wine is almost completely evaporated and reduced to a sticky glaze. Add ½ cup heavy cream, ¼ cup chicken broth and the cooked mushrooms (including all the juice they exuded), nudging the chicken here and there while gently stirring the sauce. Bring to a simmer and cook until the sauce is lightly thickened, and the chicken is cooked through, 5-7 minutes
Remove the pan from the heat. Sprinkle the parsley over the chicken and serve.
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Notes
Instead of slicing the chicken into scaloppine, you can use thin-sliced chicken cutlets.
If you have leftovers or would like to cook chicken marsala ahead, cool completely and transfer to an airtight container. Reheat in a 350F oven until warmed through.