01 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, pepper, cumin, and oregano, pressing spices into the meat.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Add chicken breasts and sear for 2-3 minutes per side until golden brown. Remove chicken from skillet and set aside on a plate.
03 - In the same skillet, add sliced onion and cook for 2-3 minutes until softened and translucent. Add minced garlic and sliced jalapeño (if using), sautéing for 1 minute until fragrant.
04 - Pour salsa verde and lime juice into the skillet, stirring to combine with aromatics. Bring mixture to a gentle simmer, scraping up any browned bits from the bottom.
05 - Return chicken breasts to skillet, nestling them into the sauce. Reduce heat to medium-low, cover with lid, and simmer for 15-18 minutes until chicken reaches internal temperature of 165°F.
06 - Remove skillet from heat and let chicken rest in sauce for 2-3 minutes. Serve chicken topped with sauce from the pan, garnished with fresh cilantro, crumbled queso fresco, and lime wedges.