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.