01 - Season the chicken pieces with salt and pepper, then toss with flour until evenly coated on all sides.
02 - Heat 1 tablespoon of olive oil and the butter in a large skillet over medium-high heat. Add the chicken pieces and sear until golden brown on all sides, about 4 to 5 minutes. Remove the chicken and set aside.
03 - In the same skillet, add the remaining olive oil. Sauté the shallot and garlic for 1 minute until fragrant and softened.
04 - Add the sliced mushrooms and cook until they release their liquid and begin to brown, about 4 to 5 minutes.
05 - Return the chicken to the skillet. Pour in the Marsala wine, scraping up any browned bits from the bottom of the pan. Allow the wine to reduce by half, about 2 minutes.
06 - Add the chicken broth and dried thyme. Simmer until the sauce thickens slightly and the chicken is cooked through, 5 to 7 minutes.
07 - Stir in the chopped parsley. Taste the sauce and adjust seasoning with additional salt or pepper as needed.
08 - Transfer to a warm serving dish, garnish with extra parsley, and serve immediately. Pairs well over rice, pasta, or mashed potatoes, or serve with toothpicks as an appetizer.