Heat oven to 350 degrees F. Cook potatoes in boiling water in large covered saucepan 10 to 12 minutes or just until potatoes are tender; drain. Remove 3/4 of the potatoes; place in large bowl. Add sour cream; mash until smooth. Stir in VELVEETA, ham and onions. Add remaining potato slices; stir gently.
Spoon into 13×9-inch baking dish sprayed with cooking spray; sprinkle with Parmesan.
Bake 30 minutes or until heated through.
Kraft Kitchens Tips:
Purchasing Potatoes: Look for firm, smooth, well-shaped potatoes that are free of wrinkles, cracks and blemishes. Avoid any with green-tinged skins or sprouting ‘eyes’ or buds.
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