01 -
Thoroughly season chicken thighs on both sides with salt, garlic powder, onion powder, paprika, Italian seasoning, and black pepper.
02 -
Heat olive oil in a large skillet over medium-high heat. Sear chicken thighs until golden brown on both sides, approximately 5 to 10 minutes, without fully cooking through.
03 -
Place seared chicken thighs into the base of a 6-quart slow cooker in a single layer.
04 -
In a large bowl, whisk together unsalted chicken stock and chicken gravy mix until smooth.
05 -
Pour gravy mixture evenly over the chicken thighs. Top with slices of butter.
06 -
Cook on low for 4 to 5 hours or on high for 2 to 3 hours until the internal temperature of the chicken reaches 165°F (74°C).
07 -
Remove chicken thighs from the slow cooker. Stir cornstarch and water together in a small bowl to create a slurry.
08 -
With the slow cooker on high, whisk the cornstarch slurry into the cooking liquid. Return chicken thighs to the slow cooker, coating thoroughly in the gravy.
09 -
Cook on high for an additional 30 minutes to thicken the gravy. Serve immediately.