How to Make It
Preheat oven to 425°F with oven rack 6 inches from heat. Stir together mustard, thyme, rosemary, pepper, and 1 1/2 teaspoons of the salt in a small bowl. Reserve 2 teaspoons of the mixture.
Stir together panko, 2 tablespoons of the oil, and 1 teaspoon of the salt in a shallow dish. Rub pork chops with mustard mixture, and dredge 1 side of pork in panko mixture, pressing to adhere. Place pork on a baking sheet lined with aluminum foil, with dredged side facing up.
Toss together potatoes, shallots, 1 1⁄2 tablespoons of the oil, and remaining 1/2 teaspoon salt in a bowl. Arrange potato mixture around pork chops. Bake in preheated oven until a thermometer inserted in thickest portion of pork registers 118°F, 18 to 20 minutes.
Increase oven temperature to broil. Toss haricots verts with 1 tablespoon of the oil, and scatter around pork chops. Broil until pork registers 135°F and vegetables are tender, about 5 minutes. Let pork rest 10 minutes (internal temperature will increase to 145°F). Whisk together vinegar, reserved 2 teaspoons mustard mixture, and remaining 2 tablespoons oil; drizzle over vegetables.