1. For the adobo: In the blender, combine guajillo chile, cascabel chile, garlic, onion, cloves, cumin, vinegar, pepper, oregano and salt. Blend until smooth, strain, and set aside.
2. On a chopping board, place butterflied chicken thighs and generously season on both sides. Set aside.
3. Preheat grill 45 minutes before using. Sear chicken thighs over direct heat for 5 minutes per side.
4. Place chicken thighs over indirect fire and constantly brush with adobo. Cook chicken thighs for 20 minutes or until they reach 329 °F. Remove from grill and let rest for 10 minutes.
5. Serve Ranchero chicken thighs with your favorite sides.