Preheat a grill or frying pan on medium to high heat and spray with olive oil. Grill the chicken breasts, turning occasionally, until lightly charred and firm to touch, about 10-12 minutes.
To make chimichurri, place parsley, garlic, chilli flakes and vinegar in a small food processor and blitz until finely chopped. Add 2 tablespoons of olive oil and mix through.
Bring a large pan of water to the boil. Add the green beans and broccolini and simmer for 4 minutes until tender. Drain. Drizzle 1 tablespoon olive oil and lemon juice over the vegetables before serving.
Meanwhile, heat microwave brown rice according to packet instructions.
Slice the chicken breast and drizzle with chimichurri.
Serve with ½ cup brown rice per person, green beans and broccolini.