Season the Chicken: Start by seasoning the chicken breasts with salt and pepper on both sides.
Brown the Chicken: Heat olive oil in a skillet over medium-high heat. Add the chicken breasts and cook for about 2-3 minutes on each side, just until browned. Transfer the chicken to the Crock Pot. (This just locks in the juices by searing the chicken, it doesn’t need to be cooked completely through)
Make the Sauce: In a large bowl, combine chicken broth, heavy cream, cornstarch, garlic powder, onion powder, Italian seasoning, and red pepper flakes (if using).
Combine with Chicken: Pour the sauce over the chicken in the Crock Pot. Add the chopped sun-dried tomatoes on top.
Cook: Cover and cook on high for 2-3 hours (or on low for 4-5 hours), until the chicken is cooked through and tender.
Finish and Serve: Just before serving, remove the cooked chicken from the crock pot and stir in the parmesan cheese until melted. Serve the chicken with the creamy sauce, garnished with chopped fresh basil. It pairs wonderfully with pasta, rice, or a fresh salad.