Melt Chocolate: In a microwave-safe bowl, melt the chocolate chips and vegetable shortening (if using) in 30-second intervals, stirring after each, until smooth.
Dip Balls: Using a fork or toothpick, dip each frozen ball into the melted chocolate, coating it completely. Return the balls to the parchment-lined baking sheet.
Set: Let the chocolate-covered balls sit at room temperature or refrigerate until the chocolate is set.
