Place the cookies in a sealable plastic bag and, using the back of a wooden spoon, crush them until they’re chunks or crumbs, depending on your personal preference. Alternatively, if you want fine crumbs, add the cookies to a blender or food processor and pulse a few times until you achieve a powder consistency.
Using a double boiler, melt the chocolate over simmering water, then add the sugar, stirring until it’s fully dissolved.
In a large bowl, mix together the crushed cookies, chocolate mixture, cocoa, milk, and vanilla.
Place your chosen topping(s) into a small bowl(s) and set aside.
Gently wet your hands and take a chunk of the chocolate mixture (around 1 tablespoon in size) and roll it into a ball. The ball should be around 1 inch in diameter.
Dip the ball into your chosen topping, roll it around to cover all sides, then place the ball on a plate or tray. Repeat with the rest of the mixture, rolling them into balls, and covering them with a topping.
You can serve the balls immediately or refrigerate them for up to an hour to firm them up a bit. The balls can be refrigerated for up to a week.