Cook chicken with the stock and bay leaf on the stovetop until just cooked. Discard bay leaf, but reserve the stock.
Place cooked chicken pieces and broccoli into an ovenproof dish.
Mix the cream of chicken soup, remaining stock, mayonnaise, yoghurt, cheese, lemon juice and curry powder in a separate bowl. Pour mixture over the chicken and broccoli.
Mix the breadcrumbs into the melted butter and sprinkle over the chicken and broccoli dish.
Bake in the oven at 190ºC (375ºF) for 35 minutes, until chicken is cooked, broccoli is al dente and breadcrumbs are golden.
Serve with rice, potatoes or anything else you'd prefer, really!