01 -
Melt the butter in a large heavy skillet over medium-high heat. Season the chicken with salt and pepper, then add to the pan. Brown on all sides by turning every few minutes, about 8 minutes total.
02 -
Remove chicken from the pan and set aside. Add the diced garlic and onion to the skillet and sauté until browned, approximately 5 minutes.
03 -
Pour in the chicken stock and add roasted red peppers. Let the mixture reduce by half over medium heat, about 5 minutes.
04 -
Turn off the heat temporarily. Whisk in the heavy cream and Parmesan cheese slowly and vigorously to form a smooth sauce.
05 -
Return heat to medium-high and add Italian seasoning, pepperoncini peppers, and the browned chicken. Let the sauce reduce by half, ensuring the chicken reaches an internal temperature of 165°F. Add extra chicken stock if sauce thickens too much.
06 -
Remove the pan from heat and serve the chicken and sauce over vegetables, pasta, rice, or enjoy as is.