It's ~scary~ simple.
In bowl, microwave white wafers on high, stirring every 30 seconds, until melted. Spread into 1/4-inch-thick layer on baking sheet lined with parchment. In bowl, microwave red wafers with shortening, stirring every 30 seconds, until smooth. Using spoon, drizzle melted red candy over white chocolate. Top with sprinkles. Let stand until set, about 45 minutes. Break into pieces.