In a large mixing bowl, combine the extra virgin olive oil, minced garlic, chopped cilantro, and sweet chili sauce. Use a whisk or spoon to mix until well combined.
Add the trimmed chicken thighs to the marinade, ensuring each piece is well-coated. Cover the bowl with plastic wrap or transfer everything to a resealable plastic bag. Let it marinate in the refrigerator for at least 30 minutes, or up to 4 hours for maximum flavor.
Preheat your skillet or grill pan over medium-high heat. Once hot, drizzle a little olive oil to prevent sticking.
Remove the chicken from the marinade, letting any excess drip off. Place the chicken thighs in the skillet, cooking for approximately 6-7 minutes per side, or until they reach an internal temperature of 165°F (75°C).
Once cooked, remove the chicken from the heat and let it rest for a few minutes. This allows the juices to redistribute, keeping the chicken moist. Serve your Cilantro Chicken with rice, a fresh salad, or your favorite sides.