01 - Pat duck breasts dry with paper towels. Score skin in a crosshatch pattern without cutting into the 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 for 6 to 8 minutes, occasionally draining excess fat, until skin is golden brown and crisp.
03 - Flip duck breasts and cook for 3 to 4 minutes for medium-rare or until desired doneness is reached. Remove from skillet, tent with foil, and let rest for 5 minutes.
04 - Discard all but 1 tablespoon of rendered fat from skillet. Add minced shallots and sauté over medium heat for 1 minute until softened.
05 - Deglaze skillet with red wine, scraping browned bits from the bottom. Add stock and thyme if using, then simmer until reduced by half.
06 - Remove skillet from heat and swirl in butter to enrich the sauce.
07 - Slice duck breasts thinly and drizzle with the prepared pan sauce.