Chocolate Mousse Layer Cake

• 150 grams plain biscuit crumbs
• 1 tbsp cocoa
• 100 grams melted butter
•  3 tbsp cream
• 90 grams dark chocolate buttons
• 1/2 can sweetened condensed milk
• 2 tbsp sugar
• 15 grams butter
• 2 tsp gelatine
• 2 tbsp cold water
• 100 ml cream
• 200 grams milk chocolate buttons
• 150 grams sour cream
• 1 cup cream, whipped

1. Combine biscuit crumbs, cocoa and melted butter and press into the base of a tin lined with plastic wrap. 
2. Chill for 1 hour
3. Heat cream, dark chocolate until melted and smooth and set aside
4. Combine condensed milk, sugar and butter and microwave on medium power until golden
5. Spread caramel over biscuit base and chill 15 minutes
6. Spread dark chocolate over and chill for 30 minutes
7. Sprinkle gelatine over water and stand for 5 minutes
8. Heat cream and chocolate until melted and smooth
9. Add gelatine and stir until dissolved
10. Cool to room temperature
11. Whisk in sour cream until smooth and then fold in whipped cream
12. Score the dark chocolate layer slightly and pour mousse over
13. Chill for 2 - 3 hours or until set