Heat olive oil in a large skillet; brown the chicken pieces for 3-5 minutes on each side.
Arrange the chicken in the bottom of slow cooker. Spread chopped onion and garlic over the browned chicken. Pour puttanesca sauce over the top. Set slow cooker on low and cook for 4 hours.
Serve over steamed rice. Sprinkle with chopped parsley.
Enjoy!
Recipe by Salu Salo Recipes at https://salu-salo.com/easy-slow-cooker-puttanesca-chicken/