1Heat oven to 375°F. Spray 9-inch square pan with cooking spray.
2In large bowl, mix beef, cereal, tomato sauce, carrot, parsley, salt, pepper and eggs just until combined. Press half of beef mixture into pan. Spread mashed potatoes on top; cover with remaining beef mixture. Spread ketchup on top.
3Bake 50 to 60 minutes or until meat thermometer inserted in center of meat reads 165°F. Cool 15 minutes; cut into 4 squares.