Make and strain the stock before commencing cooking. Bring it to the boil.
Heat the olive oil in a large, heavy based saucepan.
Sauté chopped mushrooms, pepper and cherry tomatoes in olive oil over a high heat for ~4 mins
Add arborio rice and stir constantly for about 5 minutes (the rice should be glistening and coated).
Add boiling stock ladle by ladle stirring constantly (be careful that the rice does not stick to the base) for about 15minutes.
Test a rice grain to see that it is al dente (not too hard or soft). The risotto might need extra stock and a couple more minutes cooking.
Add the cooked chicken and stir through
Remove from the heat and stir through chives and basil leaves. Serve immediately.