In a large bowl, beat butter and sugars with an electric mixer on medium speed until light and fluffy, 2 to 3 minutes. Mix in milk and vanilla. Stir in flour and salt and mix on low speed (or by hand) until incorporated. Stir in chocolate chips. Cover and chill dough for 30 minutes or until firm enough to handle.
Form dough into 1-inch balls and arrange them on baking sheets lined with parchment paper. Place sheets in the freezer for at least 15 minutes. Meanwhile, melt chocolate candy coating in a double boiler or microwave according to package directions, being careful not to overheat it. Using a fork or dipping tool, dip truffles one at a time in candy coating to cover. Tap fork on the edge of the bowl to shake off excess coating, and return truffles to baking sheets to set. If you have any leftover coating, transfer it to a piping bag or squeeze bottle fitted with a small round tip and pipe decorative lines over top of truffles-or simply drizzle coating with a fork for an abstract finish.
Refrigerated in an airtight container, truffles will keep for up to 1 week, though I dare you to make them last that long.
Reprinted with permission from The Cookie Dough Lover's Cookbook, by Lindsay Landis, copyright (c) 2012. Published by Quirk Books.