Season the chicken breasts generously with salt, pepper, and Italian seasoning.
In a pan or slow cooker, heat butter and olive oil. Sear the chicken skin side down until golden brown.
Flip the chicken and pour in white grape juice and water or chicken broth. Add paprika, garlic granules, and sun-dried tomatoes.
Cover and slow cook on LOW for 90 minutes to 2 hours until chicken reaches 165°F (75°C).
For a thicker sauce, mix cornstarch with cold water and stir into the sauce 10 minutes before cooking ends.
Stir in sour cream or heavy cream, grated Parmesan cheese, and parsley until well incorporated.
Serve the chicken over rice, noodles, or mashed potatoes.