Use either a double boiler or saucepan with a heat proof bowl. Fill the bottom pan with 2 inches of water and place over medium-high heat.
While heating, place the white candy melts (or shortening and white chocolate chips) in the top pan and place over water pan. Stirring continuously until smooth. Do not overcook or it will seize.
While the chocolate is melting, place a large sheet of parchment paper on a cookie sheet.
Spread chocolate over parchment paper using an offset spatula.
Quickly top with the Harvest Mix candy corn and broken pretzels, gently pressing down into chocolate to secure.
Melt the milk chocolate in a plastic bag, plastic pastry bag or same double boiler and drizzle on top.
Place in the refrigerator for 5-10 minutes, or until set. Remove and roughly cut with a large knife. Do not worry about cutting in nice clean squares, bark is best in rough, uneven pieces.
Store in an airtight container at room temperature.
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