01 - Pat the chicken breasts dry with paper towels. Season both sides generously with salt and black pepper, pressing the seasoning into the meat to adhere.
02 - Heat olive oil and butter in a large skillet over medium-high heat until shimmering. Add chicken breasts and sear for 4–5 minutes per side until golden brown and nearly cooked through. Transfer chicken to a plate and set aside.
03 - Reduce heat to medium. Add minced garlic to the skillet and sauté for 30 seconds until fragrant, being careful not to burn it.
04 - Add Boursin cheese, chicken broth, and heavy cream to the skillet. Stir constantly until the cheese melts completely and the sauce becomes smooth and creamy.
05 - Stir in fresh parsley and dried thyme if using. Allow the herbs to infuse into the sauce for about 1 minute.
06 - Return chicken breasts to the skillet, nestling them into the sauce. Simmer for 7–10 minutes, turning chicken occasionally, until cooked through (165°F internal temperature) and sauce has thickened slightly.
07 - Taste the sauce and adjust salt or pepper if needed. The Boursin cheese provides considerable seasoning, so taste before adding more salt.
08 - Transfer chicken and sauce to serving plates. Garnish with additional fresh parsley before serving hot.