Season the chicken on both sides with salt, pepper, and Italian seasoning.
Heat the olive oil and butter in a large skillet over medium-high heat. Add the chicken and cook 4–5 minutes per side, or until golden and cooked through. Remove from the skillet and set aside.
Add the sliced mushrooms to the pan. Cook for 4–5 minutes until they release their moisture and turn golden.
Stir in the garlic and cook for 30 seconds until fragrant.
Pour in the chicken broth and Worcestershire. Scrape up any browned bits from the bottom of the pan.
Reduce heat to medium and stir in the heavy cream and Parmesan. Simmer for 2–3 minutes until the sauce thickens.
Return the chicken to the skillet and spoon the sauce over the top. Simmer for 2 more minutes to warm through.
Garnish with fresh parsley and serve over mashed potatoes, pasta, or rice.