In a medium saucepan, combine the sweetened condensed milk, unsweetened cocoa powder, and unsalted butter.
Cook the mixture over medium-low heat, stirring constantly with a spatula or wooden spoon.
Continue stirring the mixture for about 10-15 minutes or until it thickens and starts to pull away from the sides of the pan.
Once the mixture has thickened to a fudge-like consistency, remove it from the heat and let it cool slightly.
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Scoop out tablespoon-sized portions of the mixture and roll them into smooth balls between your palms. Place the balls on a plate or tray lined with parchment paper.
Roll each brigadeiro ball in the chocolate sprinkles or coconut, until evenly coated, pressing gently to adhere.
Once all the brigadeiros are coated, refrigerate them for at least 30 minutes to firm up.
Serve the chilled brigadeiros on a platter or in individual paper cases for a delicious Brazilian treat!Store any leftover brigadeiros in an airtight container in the refrigerator for up to 1 week. Bring them to room temperature before serving for the best texture and flavor.