Season the chicken breasts on both sides with salt and pepper.
Heat olive oil in a large skillet over medium heat. Add chicken and sear for 5–6 minutes per side or until golden brown and cooked through. Remove from skillet and set aside.
Add butter and sliced mushrooms to the skillet. Cook for 4–5 minutes until mushrooms are browned and tender.
Stir in garlic and sauté for 1 minute until fragrant. Pour in the chicken broth and let simmer for 2–3 minutes.
Add heavy cream, Parmesan cheese, and thyme. Stir well and cook for another 3–4 minutes until sauce thickens slightly.
Return the chicken breasts to the skillet, coating them in the creamy mushroom sauce. Let simmer for 5 minutes to absorb the flavors. Garnish with freshly chopped parsley and serve hot with mashed potatoes, rice, or pasta.
Notes
Pair with mashed potatoes, rice, or pasta for a complete meal.