Heat oven to 400°F. Spray 8-inch square (2-quart) glass baking dish with cooking spray.

In 12-inch nonstick skillet, cook beef over medium-high heat 4 minutes, stirring frequently. Add onion and carrots; cook 4 to 6 minutes, stirring occasionally, until beef is browned and onion and carrots are softened. Add flour, thyme, salt and pepper; cook 1 minute, stirring frequently.

Gradually stir in broth; heat to boiling over medium-high heat. Cook until thickened, stirring frequently. Remove from heat; stir in frozen peas and corn; transfer mixture to baking dish.

Make mashed potatoes as directed on pouch. Spread potatoes evenly over mixture in baking dish. Bake 20 to 25 minutes or until heated through (165°F in center) and top is lightly browned. Let stand 10 minutes before serving.

To freeze: Cook beef filling as directed in recipe, but do not add frozen peas and corn. Cover and refrigerate 30 to 40 minutes. Transfer to 1-quart freezer container; freeze up to 2 months. To bake: Heat oven to 400°F. Spray microwavable 8-inch square (2-quart) glass baking dish with cooking spray. Place frozen beef filling container in large bowl filled with hot water about 5 minutes or until filling can be slid out of container into 8-inch square dish. Cover with plastic wrap; microwave on High 5 minutes; stir well. Cover and microwave 3 minutes longer; stir well. Continue heating another 3 to 4 minutes (checking and stirring every minute) until heated through. Stir in frozen peas and corn. Continue as directed in recipe.