How to Make It
Heat oven to 450° F. Toss the chicken, artichoke hearts, 1 tablespoon of the oil, and ½ teaspoon each salt and pepper on a large rimmed baking sheet. Roast, skin-side up, on the top rack until an instant-read thermometer inserted into the thickest part (avoiding the bone) registers 165° F, 30 to 35 minutes.
Meanwhile, combine the shallot, cilantro, capers, vinegar, the remaining 4 tablespoons of oil, and ¼ teaspoon each salt and pepper in a small bowl.
Serve the chicken with the watercress and bread, topped with the dressing.