HEAT oven to 400°F.
MIX meat, salsa, corn, carrots and bread crumbs just until blended; press onto bottom of 9-inch pie plate.
BAKE 30 min. or until meatloaf is done (160ºF). Meanwhile, cook potatoes and cauliflower in boiling water in large saucepan 20 min. or until vegetables are tender.
DRAIN vegetables; return to pan. Add milk; mash until vegetable mixture is light and fluffy. Spread over meat mixture to resemble a frosted cake.