01 - Arrange chicken thighs in a single layer at the bottom of the slow cooker. Distribute chopped onion and minced garlic evenly over the meat.
02 - Combine chicken broth, heavy cream, butter, Italian seasoning, paprika, salt, and black pepper in a mixing bowl. Whisk thoroughly until butter is fully incorporated and mixture is smooth.
03 - Pour the creamy seasoning mixture evenly over the chicken and vegetables, ensuring all pieces are coated.
04 - Cover and cook on LOW setting for 6 hours, or until chicken reaches internal temperature of 165°F and is fork-tender.
05 - Fifteen minutes before serving, whisk cornstarch and cold water in a small bowl until smooth and no lumps remain.
06 - Stir the cornstarch slurry into the slow cooker. Cover and cook for an additional 10-15 minutes, or until gravy reaches desired consistency.
07 - Transfer chicken thighs to serving plates and spoon thickened creamy gravy generously over the top.