Line a small, rimmed sheet pan with parchment paper and set aside.
Place your chopped chocolate in a medium microwave-safe bowl. Melt the chocolate in 30-second increments, stirring in between, for about 2 minutes in total; Or just until fully melted. Alternatively, you can use a double boiler over the stove.
Once your chocolate is melted, pour it into the prepared sheet pan. Spread it out only slightly keeping it mostly in the center of your sheet pan as shown.
In a small bowl add the pumpkin puree and pumpkin spice then stir together well to combine.
Swirl your pumpkin puree mixture into the melted chocolate from the sheet pan, lightly spreading it as shown.
Sprinkle with cranberries, pumpkin seeds, and sesame seeds.
Refrigerate or freeze until fully set.
Break your pumpkin bark into pieces and serve immediately.
Store leftover pumpkin bark in a sealed container in your freezer for up to 2 months.