01 - Combine smoked paprika, garlic powder, onion powder, dried oregano, dried thyme, cayenne pepper, black pepper, and kosher salt in a small bowl. Mix thoroughly to ensure even distribution of all spices.
02 - Pat the chicken thighs completely dry with paper towels to ensure proper seasoning adhesion and better grill marks.
03 - Place chicken in a large bowl. Drizzle with olive oil and lemon juice, then sprinkle with the prepared Cajun spice blend. Toss thoroughly until every piece is evenly coated. Cover and refrigerate for at least 30 minutes, up to 4 hours for deeper flavor penetration.
04 - Heat grill to medium-high temperature, approximately 400°F. Clean grates and lightly oil to prevent sticking.
05 - Arrange chicken on the preheated grill. Cook for 6 to 8 minutes per side until well-charred and cooked through. The internal temperature must reach 165°F when measured with a meat thermometer.
06 - Transfer grilled chicken to a clean platter and let rest for 5 minutes. This allows juices to redistribute throughout the meat. Serve hot.