Add oil and onion to a large non-stick frying pan over medium-high heat. Cook, stirring, for 2 minutes or until light golden. Add mince. Cook, breaking up lumps, for 6-8 minutes, until no longer pink. Stir in chilli powder and tomatoes. Bring to the boil. Gently boil for 3 minutes or until thickened. Stir in coriander.
Meanwhile, heat rice cups in microwave, following packet instructions.
Divide mince mixture, rice, lettuce, capsicum and beans among 4 wide, shallow bowls. Dollop avocado on top. Sprinkle with feta and extra coriander. Serve with lime wedges.
Mexican chilli powder is a blend of paprika, chilli, cumin, oregano, pepper and garlic. It’s less spicy than regular chilli powder.
Replace brown rice and ancient grains with any microwaveable wholegrain rice blend or substitute 1½ cups cooked brown rice.