01 - Arrange chicken thighs in an even layer at the bottom of the slow cooker insert. Distribute chopped onion and minced garlic evenly over the meat.
02 - In a medium mixing bowl, whisk together chicken broth, heavy cream, melted butter, Italian seasoning, paprika, salt, and black pepper until thoroughly combined and smooth.
03 - Pour the cream mixture evenly over the chicken and vegetables. Cover with lid and cook on LOW setting for 6 hours until chicken reaches internal temperature of 165°F and is fork-tender.
04 - Fifteen minutes before serving, whisk cornstarch and cold water in a small bowl until smooth to create a slurry. Stir slurry into the slow cooker, ensuring it's fully incorporated into the cooking liquids.
05 - Replace lid slightly ajar and cook uncovered for 10-15 minutes until gravy reaches desired consistency. Serve chicken thighs with generous portions of creamy gravy ladled over top.