1Crush the digestive biscuits into fine crumbs using a food processor or by placing them in a ziplock bag and crushing with a rolling pin.
Spread the biscuit crumbs evenly in the bottom of a small rectangular or square dish to form the first layer. Press down gently to compact.
In a heatproof bowl, combine the dark chocolate baking and heavy cream. Melt together over a saucepan of simmering water (double boiler method), stirring until smooth and glossy.
Remove the chocolate mixture from heat and stir in the sweetened condensed milk until fully combined.
Pour half of the chocolate mixture over the biscuit layer and spread evenly with a spatula.
Add another layer of biscuit crumbs (if desired, reserve a small amount for topping), then pour the remaining chocolate mixture over the top and spread evenly.
Optionally, sprinkle any reserved biscuit crumbs on top for garnish.
Refrigerate the dish for at least 2 hours, or until set and firm.
Slice into squares and serve chilled. Enjoy your Layered Chocolate Biscuit Delight!