Prepare the Base:
In a mixing bowl, whip together the yogurt, peanut butter, and optional sweetener until smooth and well combined.
If desired, fold in a handful of mini chocolate chips for extra texture.
Form the Bars:
Line a tray with parchment paper.
Drop spoonfuls of the yogurt mixture onto the parchment-lined tray, forming small blobs.
Press a popsicle stick or small spoon into each blob, then smooth down the mixture around the stick.
If using, sprinkle a few chopped peanuts onto each bar for added crunch.
Freeze:
Place the tray in the freezer and freeze the bars until they are firm.
Coat with Chocolate:
Carefully melt the chocolate chips in a microwave or over a double boiler.
Stir in the optional coconut oil for a smoother chocolate sauce.
Once the bars are frozen solid, dip each one into the melted chocolate to coat.
Return the bars to the tray and freeze again until the chocolate shell is set.
Serve:
Once the chocolate has hardened, the Buster Bars are ready to enjoy. Store any leftovers in the freezer.