01 - Pat duck breasts dry with paper towels. Score skin in a crosshatch pattern without cutting into meat. Season both sides generously with salt and pepper.
02 - Place duck breasts skin side down in a cold, dry skillet over medium heat. Cook 6–8 minutes, draining excess fat occasionally, until skin is golden brown and crisp.
03 - Flip breasts and cook an additional 3–4 minutes for medium-rare or to desired doneness. Remove from pan, tent loosely with foil, and rest 5 minutes.
04 - Discard all but 1 tbsp rendered fat in the pan. Add shallots and sauté 1 minute over medium heat until softened.
05 - Deglaze pan with red wine, scraping up browned bits. Add stock and thyme if using; simmer until reduced by half.
06 - Remove from heat and swirl in butter to complete the sauce.
07 - Slice duck breasts thinly and drizzle with pan sauce.