In double boiler or microwave safe dish, melt chocolate chips. Stir constantly, or in 30-second increments if using the microwave method.
Line a large baking sheet with Parchment paper and pour melted chocolate in the center of the pan. Using the back of the spoon, spread the chocolate out (it won't reach all the edges of the pan and that's okay). Spread to desired thickness.
Place pretzels in a scattered arrangement on top of chocolate then sprinkle popcorn, Andes Mint pieces and sprinkles over the top.
Refrigerate for 25-30 minutes, or until firm enough to cut. Remove chocolate from parchment and cut into irregular triangles, on a cutting board. Serve immediately or store in an airtight container.