Line a large baking sheet, like a cookie sheet, with parchment paper. In a bowl, stir together the blueberries and plain greek yogurt until well combined
Working one frozen cluster at a time, place it into the melted chocolate and use a fork or spoon to ensure that the entire clustered is covered in chocolate.
Store the blueberry clusters in the freezer at all times. They're best eaten frozen but can be left out at room temperature for a few minutes to soften slightly.