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ADD milk to drink mix in large freezerproof non-metal bowl; stir until mix is dissolved. Freeze 2 hours or until partially frozen.
SPOON into blender; blend on high speed until smooth. Return to bowl. Whisk in COOL WHIP. Freeze 4 hours or until frozen.
REMOVE from freezer 20 min. before serving. Let stand at room temperature to soften lightly.