Line a large sheet pan with parchment paper or foil. Place the mint cookies in the freezer for at least 30 minutes; the longer, the better.
Add unwrapped candy canes to a large plastic bag (double-bag if needed to avoid tears). Seal without air and crush with a rolling pin or meat mallet into coarse crumbs. Set aside.
Combine white chocolate melts and oil in a microwave-safe bowl. Heat in short bursts, stirring until fully melted. Let cool slightly so it’s warm but not hot. (Hot chocolate will melt the mint cookie coating.)
Remove a few cookies from the freezer at a time. Using a fork, dip each cookie in the melted chocolate, coating it completely. Tap the fork gently on the side of the bowl to remove excess chocolate. Use a knife to slide the coated cookie onto the prepared sheet pan. Work quickly to avoid melting the mint cookie coating into the white chocolate. (See Note 4 for troubleshooting.)
Immediately sprinkle crushed peppermint on top of each cookie before the chocolate hardens. Repeat until all cookies are coated and topped.
Let cookies sit at room temperature until the chocolate is firm. Do not refrigerate or freeze to set the chocolate.
Video
Notes
Note 1: Use a package of fudge mint or grasshopper cookies. If you’d prefer to make your own grasshopper cookie, try this thin mint cookie recipe from my friend Sally!Note 2: I recommend chocolate made for melting like good quality baking bars (such as Bakers®, Lindt®, or Ghiradelli®) or good quality melting wafers (such as Ghiradelli) for best results.Note 3: I like topping the dipped cookies with a sprinkle of crushed candy canes or finely chopped peppermint bark chocolates.Note 4: Troubleshooting:
If the chocolate is too thick to coat the cookies, add 1/2 teaspoon additional oil.
If the chocolate hardens while working, reheat in the microwave for 15-second intervals.
If the mint cookie coating melts into the white chocolate, freeze the cookies longer or allow the white chocolate to cool more before dipping.
Storage: These cookies are best eaten within a week. Store in a tightly sealed container in a cool, dark place at room temperature. They don’t need to be refrigerated but are tasty that way too!