Line a small baking tray or large plate with parchment paper.
In a mixing bowl, combine the Greek yogurt, honey, and vanilla extract until smooth.
Spread the yogurt mixture evenly onto the prepared tray about ½-inch thick.
Drizzle the pistachio cream over the yogurt and gently swirl with a spoon or knife.
Melt the chocolate until smooth and drizzle across the top.
Sprinkle chopped pistachios evenly over the bark.
Freeze for at least 4 hours or until completely firm.
Break into irregular pieces and serve immediately.