Let cook for 10-15 minutes--when the chicken is cooked through and the cauliflower is crisp tender, add the peas (if using fresh, let them cook for 5 minutes, but as I always use frozen I just heat them through). Place the yogurt (or sour cream0 in a medium-small bowl, and add sauce from the cooking curry by the spoonful to the yogurt, whisking the sauce in each time. When the yogurt sauce is quite warm, mix it back into the sauce. Depending on your cooktop, either turn the heat off or keep it quite low. You do not want to bring the curry to a hard boil and break the yogurt, you just want it to mix in and blend with the whole and be heated through.