Line Baking Pan: Line a 9 x 9 inch (22cm x 22cm) square baking pan with parchment paper. Set aside.
Crush Biscuits: In a high-speed food processor, crush biscuits to a crumb. Transfer to a large mixing bowl.
Add Coconut and Cocoa: Stir through desiccated coconut and cocoa powder.
Mix Wet Ingredients: Add the melted butter and milk. Mix until well combined and it sticks together.
Press into Pan: Firmly press the mixture into the lined pan. Use the back of a spatula, a wooden spoon, or your hands to ensure the base is compact.
Chill: Place the pan in the refrigerator to chill while preparing the topping.
Chocolate Topping
Melt Chocolate: Melt the chocolate in a double boiler or microwave.
Pour and Spread: Pour and spread over the biscuit base.
Chill Again: Chill for 1-2 hours or until firm.
Serve: Cut into squares and enjoy!
Notes
Store: Keep the chocolate slice in an airtight container in the refrigerator for up to one week. If you prefer, freeze the slices for up to one month, then thaw them in the refrigerator before enjoying.