Using an electric mixer, beat the peanut butter & sugar together until smooth & stiff. Beat in the vanilla extract.

Shape the peanut butter mixture into 20 1-inch balls & place on a waxed paper-lined sheet tray. Place the tray in the freezer for 1 hour.

Add the chopped chocolate to a small bowl set over gently simmering water. Stir to melt. Remove the chocolate from the heat.

With 2 forks, carefully dip the chilled peanut butter balls halfway into the chocolate & let the excess drip off. Lay onto the waxed paper-lined tray. With a fork, swirl some decorative design across the top of each bite.

Place in the refrigerator for the chocolate to set & the peanut butter to solidify, for about 30 minutes.