Place the coconut, coconut yogurt, sweetener, and vanilla into your food processor. Blend into a chunky paste.
Mold the mixture into 8 rectangle bar shapes and place onto a baking tray lined with parchment. I highly recommend using disposable food safe gloves to prevent the mixture from sticking to your hands.
Cover and set the bars in the fridge for at leave 3 hours, or overnight for best results.
Place the chocolate into a heatproof bowl over a small saucepan of simmering water. Heat until about 60% melted, then remove from the heat and continue stirring until fully melted.
Drop the bars, one at a time into the chocolate, using a fork to drizzle the chocolate over the bar. Gently lift the bar out of the chocolate and tap on the edge of the bowl to drain off the excess. Use a butter knife to push the bar back onto the lined tray. Repeat with the remaining bars.
Set in the fridge for another 1-2 hours, until the chocolate is set.