Finely chop the milk and dark chocolate separately. In a medium bowl, microwave half of the milk chocolate at 50 percent power in 30-second intervals, stirring between intervals, until melted, about 2 minutes. Add the remaining milk chocolate and stir until completely melted. Repeat with the dark chocolate in a separate bowl. Using a silicone or offset spatula, spread the milk chocolate evenly (about 1/4 inch thick) onto a parchment paper-lined baking sheet. Sprinkle with the sesame sticks, pretzels, potato chips, and cereal; drizzle with the dark chocolate. Chill until set, about 30 minutes. Cut into irregular pieces.
The Do's and Don'ts of Cooking with Chocolate