In a large skillet over medium-high heat, sauté the ground beef for 6-8 minutes, or until the meat is cooked through, stirring frequently to break up the meat.Drain, if needed.Add ketchup and Worcestershire sauce and stir well to combine.Add peas and carrots and stire well to combine and defrost.
Place 1 cup of meat mixture into four large ramekins and top with about ½ cup mashed potatoes, spreading to cover the meat.Place the ramekins on a baking sheet.Bake for 10 minutes or until the tops are golden brown and then remove from oven.Let cool for 5-10 minutes before serving.