Garlic-Marinated Chicken Cutlets with Grilled Potatoes

INGREDIENTS

• 3 pounds baby red new potatoes, halved or quartered if large
• 2 tablespoons olive oil, plus more for grates
• 6 garlic cloves, minced
• 1/4 cup white-wine vinegar
• 3 tablespoons fresh thyme leaves, chopped, plus sprigs for garnish, if desired
• Coarse salt and ground pepper
• 3 pounds chicken cutlets (about 12)
• 1 tablespoon butter
• Grilled asparagus, cut on the diagonal into 1 1/2-inch pieces (3 cups)
• 2 tablespoons Vinaigrette