Line a 9x13 inch rimmed baking sheet with parchment paper.
In a medium mixing bowl, whisk together the Greek yogurt, honey, and vanilla extract until the texture is smooth and the sweetener is fully incorporated.
Transfer the yogurt mixture to the prepared baking sheet and spread into an even layer approximately 1/4 inch thick using an offset spatula.
Place the peanut butter in a microwave-safe bowl and heat for 20-30 seconds until fluid; drizzle the peanut butter over the yogurt layer.
In a separate microwave-safe bowl, combine the chocolate chips and coconut oil; heat in 30-second intervals, stirring between each, until completely melted and smooth.
Drizzle the melted chocolate over the peanut butter and yogurt layers.
Use a toothpick or the tip of a knife to gently swirl the chocolate and peanut butter into the yogurt to create a marbled pattern.
Sprinkle the crushed peanuts evenly over the surface.
Transfer the tray to the freezer and chill for at least 3 hours, or until the bark is completely solid.
Remove from the freezer, break the bark into irregular shards by hand or with a knife, and serve immediately. Store leftovers in an airtight container in the freezer.