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