Heat 2 Tablespoons of olive oil in the fry pan.
Add the garlic, and sauté for one minute.
Add the mushrooms.
Cook for 5 minutes, stirring frequently, until the mushrooms have softened and the moisture has evaporated.
Remove the mushrooms from the pan and set aside.
Heat a further Tablespoon of oil in the fry pan.
Add the thinly sliced chicken breast.
Cook for 3 -4 minutes, or until the chicken is just cooked.
Add the mushrooms back to the pan, then continue as below.