Then place on your mug to let the cookie cool completely. You may need to mold the cookie a bit to the mug carefully. The smaller cookie also helps to balance the larger cookie.
Once the cookies are cool, place your melting chocolate into a double boiler and melt. Then carefully dip the top of the smaller cookie into the melting chocolate and place on a parchment lined sheet. Put in the fridge for 10 minutes or until the chocolate has set.
Remove from the fridge. Get a glass or bowl of warm water and your paring knife. Place knife into the warm water and let the knife warm. Remove from water, dry off and then use knife to remove any chocolate that has covered the little wedge that you cut out earlier.
Place mug toppers on your mugs and fill mugs with your favorite hot beverage.