In a medium bowl, season the chicken breasts with salt and pepper.
In a large skillet, heat olive oil over medium heat.
Add the chopped onion and minced garlic to the skillet, sautéing for about 2-3 minutes until fragrant.
Add the sliced mushrooms and continue cooking until they soften, about 5 minutes.
Push the mushroom mix to the side of the skillet and add the seasoned chicken. Cook until browned on both sides, about 5 minutes.
Pour in the heavy cream and stir everything together. Lower the heat and let it simmer for about 10 minutes until the chicken is cooked through and the sauce thickens.
Garnish with fresh parsley before serving and enjoy with crusty bread.
Notes
Store leftovers in an airtight container for up to 2 days. Reheat in a skillet over medium heat to maintain the sauce's creaminess.