01 - Line a 9x13-inch baking sheet with parchment paper to prevent sticking.
02 - Combine Greek yogurt, honey or maple syrup, and vanilla extract in a medium bowl. Whist until completely smooth and well incorporated.
03 - Pour the yogurt mixture onto the prepared baking sheet. Use a spatula to spread it evenly into a layer about 1/2-inch thick.
04 - Distribute sliced strawberries evenly across the yogurt surface. Sprinkle with chocolate chips and pistachios if desired.
05 - Place dark chocolate chips and coconut oil in a microwave-safe bowl. Microwave in 20-second intervals, stirring between each, until completely smooth and melted.
06 - Drizzle the melted chocolate mixture over the yogurt and toppings using a spoon or creating zigzag patterns.
07 - Transfer the baking sheet to the freezer. Freeze for at least 2 hours or until completely firm and set throughout.
08 - Remove from freezer and break the frozen bark into irregular pieces. Serve immediately. Store any leftovers in an airtight container in the freezer for up to 2 weeks.