01 - Set oven to 400°F (200°C) to prepare for roasting.
02 - Pat duck breasts dry with paper towels. Score skin in a crosshatch pattern without cutting into the meat.
03 - Season both sides evenly with sea salt and freshly ground black pepper.
04 - Heat a heavy oven-safe skillet over medium heat. Place duck breasts skin side down without oil and cook 6–8 minutes until skin is golden and most fat has rendered, spooning off excess fat as needed.
05 - Flip duck breasts; add thyme and crushed garlic to skillet. Cook for 1 minute.
06 - Drizzle honey and balsamic vinegar over duck. Transfer skillet to oven and roast 6–8 minutes for medium-rare or until preferred doneness.
07 - Remove skillet from oven. Add unsalted butter and spoon melted butter over duck to glaze. Rest duck breasts for 5 minutes before slicing.
08 - Thinly slice duck breasts and garnish with chopped parsley if desired.