Heat a dash of oil in a deep frying pan. Brown chicken over a high heat. This may be best done in 2 batches.
Reduce heat. Pour over HEINZ [SERIOUSLY] GOOD™ Honey Mustard Simmer Sauce . Stir and simmer for 15-20 minutes, stirring occasionally until chicken is cooked. Transfer to an ovenproof pie dish and allow to cool. Top with 1 sheet of ready rolled flaky puff pastry, trimming the edges of the pastry as necessary. Brush pastry top with a little beaten egg to glaze the pastry and sprinkle over sesame seeds if wished.
Bake at 200°C (fan bake) for 20-25 minutes until pastry is golden brown and filling hot. Serve with your favourite vegetables.