Prepare a nine-by-13-inch baking dish by lining it with parchment paper.
In a microwave-safe bowl, melt the almond bark, heating 30 seconds at a time and stirring in between, until it is all melted. Stir in the peanut butter.
Once everything is smooth, stir in the marshmallows, cereal and chocolate chunks.
Spread the mixture evenly into the prepared pan. Sprinkle with a few more toppings, if desired.
Let the mixture cool completely on the counter or in the refrigerator and then cut into squares. Store in an airtight container.