In a small bowl combine oil, salt, smoked paprika and onion powder. Place chicken in a large zip top plastic bag and pour oil mixture over. Allow to marinate for 30 minutes.
Make the Sauce
Meanwhile, make the avocado sauce by combining the avocado, Greek Yogurt, red onion cilantro, jalapeño and lime juice in a blender. Process until smooth. Refrigerate until ready to serve.
Cooki
Preheat grill pan to medium heat. Remove chicken from marinate and place on grill pan. Cook about 8 minutes per side, or until cooked through.
Serve
To serve, place chicken on a plate and top with avocado sauce.