Place 1.3kg of boneless & skinless chicken breast on a cutting board, then season with 2 tsp chilli powder, 1.5 tsp cumin, 1 tsp salt, 1 tsp black pepper, 2 tsp smoked paprika, 1 tsp garlic powder, 1 tsp onion powder, and ½ tsp oregano. Spray the chicken with light cooking oil and mix well to coat each side evenly in the seasoning mixture.