1. Melt keto ice cream in the refrigerator for 2-3 hours until soft. Can also defrost in the microwave. Once soft or liquid, pour into a small parchment lined baking tray. Use a container that will ensure a 1/2 to 1 inch thickness of ice cream. Then refreeze.
2. Add almond flour, coconut flour, sweetener, cocoa powder, egg yolk, butter, vanilla and salt to a small bowl. Mix together with a fork until a dough forms and is evenly incorporated.
3. Place dough ball in between two sheets of parchment paper. Using a rolling pin, roll out to ⅛ inch thick. Cut into square or rectangle shape using a knife, cookie cutter or pizza cutter.
5. Once ice cream is refrozen, cut into a shape to fit the cookies. Sandwich the ice cream in between the cookies. Store wrapped in parchment or wax paper and store in the freezer in a freezer safe bag.