Melt 12 ounces chopped white chocolate in microwave, stirring often. Add 1 tablespoon melted shortening and an additional 4 ounces chopped white chocolate. Stir. Spread on a parchment-lined baking sheet. Top with 1 cup or so of crushed, peppermint candies (depends on how minty you want it). Let harden then break into pieces.