Gently melt the milk chocolate chips in a microwave-safe bowl. Heat in 30-second bursts, stirring well after each interval, until completely smooth and melted.
Let the melted chocolate cool down to room temperature for about 8-10 minutes. This key step prevents it from melting the whipped topping.
Line an 8x8-inch baking dish with parchment paper, ensuring there's an overhang on the sides. This makes lifting the candy out super easy.
Carefully and gently fold the thawed Cool Whip into the cooled melted milk chocolate until the mixture is uniform, light, and fluffy. Be careful not to overmix!
Transfer the chocolate-Cool Whip mixture into your prepared pan, spreading it evenly with a spatula. Place it in the freezer for about 30 minutes until it becomes firm to the touch.
Remove the firm chocolate slab from the freezer using the parchment paper overhang. Peel off the parchment and slice it into approximately 36 squares or your preferred bonbon shapes. Arrange these pieces on a fresh parchment-lined baking sheet and return them to the freezer for another 20-30 minutes. This ensures they're firm enough for dipping.
While the squares are chilling, gently melt the dark chocolate (or wafers) in a microwave-safe bowl. Use 30-second intervals, stirring thoroughly each time, until you have a silky, smooth melted chocolate.
Using a chocolate dipping fork (or two regular forks), dip each frozen chocolate square into the melted dark chocolate, allowing any excess to drip off back into the bowl.
Immediately place the dipped candies on a fresh parchment-lined tray. If you're using festive sprinkles, add them now before the chocolate sets. Refrigerate or freeze until the dark chocolate coating is completely firm and shiny.
Store these delightful candies in an airtight container in the freezer until you're ready to serve. They taste best when cold!