Heat 10-inch nonstick ovenproof skillet over medium-high heat. Add ground meat and cook for 8 minutes until cooked through, breaking up with a wooden spoon. Add 2 teaspoons of the Greek seasoning, tomato sauce and peas and carrots. Bring to a boil. Lower heat to medium and simmer for 5 minutes, stirring occasionally.
Heat mashed potatoes in a microwave oven following package directions. Stir in remaining teaspoon of the Greek seasoning.
Heat broiler. Spread heated potatoes over meat mixture. Wrap handle in foil. Place skillet under broiler, about 4 inches from heat, for 2 to 3 minutes until potatoes are nicely browned. Makes 6 servings.