A magnificent treat that can be made ahead of time.
To make bars: Line 8- or 9-inch square pan with foil, leaving foil hanging over 2 sides for easy removal. Melt 1 tablespoon butter; grease foil in pan with melted butter. Press white chocolate mixture into pan. Drizzle with dark chocolate mixture. Refrigerate 2 hours before cutting.
Sprinkle snickerdoodle drops with colored sugars.
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