In two separate bowls, melt the dark chocolate and white chocolate for about 2 minutes (or until melted) at 30-second intervals.
Add in your pumpkin spice to your white chocolate and mix thoroughly.
On a parchment-lined sheet, add the first layer of melted dark chocolate. Be sure to spread it evenly into a rough rectangle shape.
Next, layer your pumpkin spice white chocolate on top of the dark chocolate. NOTE: You can add small clumps all around the dark chocolate layer and swirl it for a pretty design.
Top off your chocolate layers with the pumpkin seeds, dried cranberries and pistachios.
Place in fridge for 30 minutes or in freezer for 15 minutes for the chocolate to harden.