Begin by crushing the Arrowroot and baby biscuits into fine crumbs using a food processor or a zip-lock bag with a rolling pin.
In a large mixing bowl, combine the crushed biscuits, glacé cherries, sweetened condensed milk, melted coconut oil, and desiccated coconut. Stir until evenly combined.
Line your baking dish with parchment paper. Transfer the mixture into the dish and press it down firmly with a spatula or your hands.
Chill the baking dish in the refrigerator for about 30 minutes to allow the base to set.
In a microwave-safe bowl, melt the dark chocolate candy melts in 30-second intervals, stirring in between until smooth.
Once melted, pour the chocolate over the chilled coconut base and spread it evenly with a spatula.
Return the baking dish to the refrigerator and let it chill for another hour until the chocolate has set completely.
Lift the slice out using the parchment paper, cut into squares or bars, and serve.