There's nothing better than a grab-and-go treat!
In bowl, mix first 5 ingredients with 2 tbsp. ketchup; season. Place mixture in center of pastry squares; moisten edges with water and fold over to form rectangles. Seal edges and slice four vents in top of each. Bake at 425° until pastry is golden, 18 minutes. Whisk remaining 1/2 cup ketchup with Worcestershire sauce for dip.