Prepare the Chicken: Season the chicken breasts with salt, pepper, and half of the ranch seasoning mix.
Sear the Chicken: Heat olive oil in a large skillet over medium heat. Sear the chicken for 4-5 minutes per side until golden brown, then remove from the skillet and set aside.
Make the Creamy Sauce: Lower the heat and add heavy cream to the skillet. Stir in sun-dried tomatoes, Parmesan cheese, garlic powder, onion powder, dried basil, red pepper flakes, and the remaining ranch seasoning mix. Let it simmer for 2-3 minutes.
Combine Everything: Return the chicken to the skillet, spooning the sauce over the top. Cover and let it simmer for another 8-10 minutes until the chicken is fully cooked and the sauce thickens.
Serve & Enjoy: Let the dish rest for a couple of minutes before serving. Garnish with extra Parmesan or fresh herbs if desired. Serve hot with pasta, rice, or roasted vegetables.