Place a sheet of parchment paper on a baking sheet.
Add dark chocolate chips and peanut butter to a microwave safe bowl. Microwave on high for 1 minute. Remove from microwave and stir. Repeat heating at shorter intervals, 15 to 20 seconds, until the chocolate is completely melted and has a smooth consistency.
Pour melted chocolate and peanut butter mixture onto baking sheet, spread the chocolate onto baking sheet so it’s about ¼” thick.
Sprinkle with bar pieces, sliced peanuts, raisins, and pretzels.