01 - Line a baking sheet with parchment paper and set aside.
02 - In a medium mixing bowl, combine the creamy peanut butter, Greek yogurt, maple syrup or honey, and vanilla extract. Stir until the mixture is completely smooth and uniform.
03 - Using a small cookie scoop or heaping teaspoon, portion the filling onto the prepared baking sheet, spacing each mound slightly apart. Aim for approximately 24 uniform bites.
04 - Transfer the baking sheet to the freezer and chill for at least 2 hours, or until the bites are completely firm and solid to the touch.
05 - Place the chopped dark chocolate and coconut oil, if using, in a microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until the chocolate is fully melted and smooth. Alternatively, melt using a double boiler.
06 - Remove the frozen bites from the freezer. Using a fork or dipping tool, submerge each bite into the melted chocolate, allowing any excess to drip off. Return each coated bite to the parchment-lined baking sheet.
07 - Immediately sprinkle the tops of each coated bite with flaky sea salt before the chocolate begins to set.
08 - Return the coated bites to the freezer for 10 to 15 minutes, or until the chocolate shell is firm and glossy.
09 - Transfer the finished bites to an airtight container and store in the freezer for up to 1 month. Serve directly from the freezer or allow to thaw slightly for a softer texture.