Season chicken with salt and pepper. Heat oil in a large saute pan over high heat, add the chicken and brown on all sides, 8-10 minutes. Transfer to a plate. Remove fat, leaving 1 Tbsp. of drippings. Reduce heat to medium and add fennel wedges, artichokes and onions, stir and cook for 2-3 min. until slightly browned.
Return chicken to skillet along with any juices and add stock. Cover with a lid and reduce heat to medium low, continue to cook for 18-20 min. until the chicken is cooked through.
Remove chicken and vegetables to a serving platter. Bring liquid up to a rapid boil, stir in vinegar and reduce to about 1/3 cup. Pour sauce over the chicken and garnish with the fennel fronds and parsley.
Nutrition calculation is an estimation only. If you need nutritional calculations for medical reasons, please use a source that you trust.