Place diced chicken into a bowl, add spices (garlic, paprika, coriander, cumin, oregano, chilli (if using), salt, pepper and lime juice). Mix well and marinate in the fridge for 15 minutes whilst chopping up the ingredients for the toppings.
Cook rice in the microwave and set aside.
Chop lettuce and avocado and have all the toppings set out on the bench.
Heat a grill pan or skillet, add chicken and pan fry until golden and cooked through.
Assemble 4 bowls with rice, chicken, red kidney beans and the rest of the toppings.