Combine salt, chilli powder, oregano, cumin, coriander, paprika, onion and garlic powder in a smal bowl.
Place chicken in an oven dish and top with the olive oil, tomato paste and spice mix. Rub into the chicken until its evenly coated.
Place in oven and cook for 30 minutes until the chicken is browned and cooked through. Let the chicken rest for 5 minutes before slicing with a sharp knife. return the chicken to the pan with all the juices until your ready to assemble your bowls.
To assemble, place half cup of cooked rice in each bowl and top with a handful of spinach leaves. Add the sliced chicken and some of the juices then evenly divide the tomato, cucumber and beans.
Finish off with the avocado, corn chips and a big dollop of sour cream or natural yoghurt.