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MIX milk and vinegar in medium bowl; let stand 2 min. Whisk in egg.
COMBINE next 5 ingredients in large bowl. Add milk mixture and butter; mix well.
LADLE batter onto hot griddle or into hot skillet sprayed with cooking spray, using 2 Tbsp. batter for each pancake; cook until bubbles form on tops, then turn to brown other sides.
STACK 3 pancakes on each of 4 serving plates, spreading 2 tsp. cream cheese spread between each layer. Cover with remaining pancakes; sprinkle with powdered sugar.