Heat oven to 350 degrees F.
Whisk Cooking Creme, milk and pepper until well blended.
Layer half each of the potatoes, Cooking Creme mixture and Parmesan in shallow 2-L casserole dish sprayed with cooking spray. Repeat layers; cover.
Bake 1 hour 15 min. or until potatoes are tender and sauce is hot and bubbly, uncovering after 45 min.
Cut 4 green onions into thin slices. Reserve 2 Tbsp.; toss potatoes with remaining onions before layering in casserole dish as directed. Sprinkle remaining on top for garnish.
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