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Place milk chocolate chips and peanut butter chips in large microwave-safe bowl. Microwave at (MEDIUM) 50% 1 minute; stir. If necessary, microwave at MEDIUM an additional 10 seconds at a time, stirring after each heating, until chips are melted and mixture is smooth when stirred. Immediately add chow mein noodles (break very large noodles); stir well to coat completely