HEAT oven to 375°F.
COOK onions in dressing in skillet on medium heat 8 to 10 min. or until golden brown, stirring frequently.Cool slightly.
MIX meat, onions, 1/4 cup ketchup, stuffing mix, water and egg whites. Shape into 10x5-inch loaf in 13x9-inch baking dish; cover with remaining ketchup.
BAKE 55 min. to 1 hour or until done (160°F). Sprinkle with cheese; bake 2 min. or until melted.
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