Heat olive oil in a large skillet over medium-high heat. Season chicken breasts with salt and pepper, then sear them for 6-7 minutes per side until golden and cooked through. Remove from skillet and set aside.
In the same skillet, add the sliced mushrooms and garlic. Sauté for 3-4 minutes until the mushrooms are tender.
Pour in chicken broth and heavy cream. Stir in Parmesan cheese, bringing the sauce to a simmer. Let it cook for 5-7 minutes until the sauce thickens.
Return the chicken to the skillet and cook for an additional 2-3 minutes, allowing the chicken to absorb the flavors.
Garnish with fresh parsley and serve.
Notes
For a lighter version, substitute half-and-half for the heavy cream.
Can be served over pasta, rice, or mashed potatoes for a complete meal.