Prepare the Truffle Mixture: In a saucepan, combine the sweetened condensed milk, cocoa powder, and unsalted butter.

Cook the mixture over low heat, stirring continuously, until the butter is melted and the ingredients are well combined.

Add the chopped sweet chocolate to the saucepan and continue to cook, stirring constantly, until the chocolate is completely melted and the mixture is smooth and glossy.

Remove the saucepan from the heat and let the mixture cool to room temperature. This will allow it to thicken slightly, making it easier to shape into truffles.

Shape the Truffles: Once the truffle mixture has cooled, use a spoon or a small cookie scoop to portion out small amounts of the mixture.

Roll each portion between your palms to form smooth, round truffles. Place the shaped truffles on a parchment-lined baking sheet, leaving some space between each one.

Decorate the Truffles: Pour the chocolate sprinkles into a shallow dish or plate.

Gently roll each truffle in the chocolate sprinkles until they are evenly coated.

Place the decorated truffles back onto the parchment-lined baking sheet and refrigerate them for at least 30 minutes to allow them to firm up.

Serve and Enjoy: Once the chocolate truffles are firm, they are ready to be served and enjoyed.

Serve these decadent treats on a platter or in decorative boxes or bags for gifting.

Store any leftover truffles in an airtight container in the refrigerator for up to two weeks.