1. In a double boiler, melt butter, sugar, and cocoa. Stir until smooth. Gradually whisk in beaten egg, stirring constantly until thickened. Remove from heat and stir in graham crumbs, almonds, and coconut. Press into a greased 8x12-inch pan.
2. Using a hand mixer, beat together butter, cream, custard powder, and sugar until light and fluffy. Spread over the crust and chill while you prepare the topping.
3. Melt chocolate chips with butter in a microwave or over a double boiler. Cool slightly, then pour over the custard layer and spread evenly with a spatula.
4. Chill for at least 2 hours or overnight. Slice into bars with a warm knife and enjoy!
Notes
Store in the fridge for up to a week, or freeze for up to 3 months. Use vanilla pudding powder if custard powder isn’t available. Chill fully before slicing for clean cuts.