Melt the chocolate in a small microwave safe bowl. Microwave on high for 10 second intervals, stirring in between, until melted and smooth.
Place the apple slices on a plate and drizzle with melted chocolate and peanut butter. If your peanut butter is a little thick, you can also melt it in the microwave before drizzling over the apple slices. Transfer to the fridge to let the chocolate harden a little, about 10 to 15 minutes. Enjoy!