Start by seasoning your chicken with salt and pepper. Melt the butter in a large skillet over medium-high heat, then add the chicken strips. Cook for about 6 minutes, turning occasionally, until browned on all sides. You’re looking for a golden sear, not fully cooked through yet.
Transfer the chicken to a plate. Don’t worry if it’s not fully done — it will finish cooking later in the sauce. This resting step helps keep it juicy while you build the flavor base.
In the same pan, add the diced onions. Cook for 4–5 minutes until soft and translucent. The onions absorb those browned bits left from the chicken, which deepens the overall flavor.
Toss in the minced garlic and roasted red peppers. Stir for about 2 minutes until fragrant. This layer of sweetness and aroma really makes the sauce pop.
Pour in the chicken broth and add the sliced pepperoncini. Bring the mixture to a simmer and let the flavors meld. Return the chicken to the skillet, and let it simmer until the chicken is fully cooked and tender.
Reduce the heat to low, then slowly stir in the heavy cream and Parmesan cheese. Mix until the cheese melts and the sauce thickens slightly — about 4 minutes. Avoid boiling; gentle heat keeps the sauce silky smooth.
Finish with a sprinkle of Italian seasoning, extra Parmesan, and some chopped parsley or basil. Serve warm and let that creamy, tangy aroma fill your kitchen.