Heat oven to 350 degrees. Combine pretzels and melted butter in small bowl; press evenly into bottom of 13x9-inch baking pan. Place sweetened condensed milk and unsweetened chocolate in small microwave-safe bowl. Microwave at HIGH 1 to 1-1/2 minutes or until mixture is melted and smooth when stirred. Pour over pretzel layer in pan. Top with marshmallows, coconut and pecans; press firmly down onto chocolate layer. Bake 25 to 30 minutes or until lightly browned; cool completely in pan on wire rack. Melt semi-sweet chocolate and shortening in small microwave-safe bowl at HIGH for 1 minute or until melted when stirred; drizzle over entire top. Refrigerate 15 minutes or until set. Cut into bars.

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