Heat oil in a large frying pan over medium heat. Add cut up chicken pieces, saute until cooked through (abut 5 mins.) Add green beans and continue cooking for 3 more minutes.
While the chicken cooks, start the peanut curry sauce.
In a medium mixing bowl, whisk together all the sauce ingredients. Pour over the chicken & green beans; stir to combine. Turn the heat to high and bring to a boil. Stir occasionally. Reduce heat and simmer until sauce is thickened (about 6-8 mins.)