Cut each pastry sheet in half diagonally. Combine Birds Eye Country Harvest vegetables, Edgell Creamed Corn and seeded mustard together in a bowl. Divide mixture into six equal parts.
Spoon 1/6 of the mixture over one half of a pastry piece leaving a 2cm border around the edges. Brush edges of pastry with egg, fold pastry in half to form a triangle. Crimp edges of pastry together (see photo) to seal. Repeat with remaining mixture and pastry.
Brush pasty with remaining egg. Bake in a preheated oven at 200°C for 25-30 minutes or until golden brown.