How to make Chocolate cake with caramel cream Mascarpone

Ingredients:

For cake:
125g butter
220g sugar
1 tsp vanilla extract
3 eggs
130ml milk
200g flour with baking powder
3 tbsp cocoa

For a cream:
250g mascarpone cheese
400g caramel (for example boiled condensed milk)
240ml heavy cream

chocolate sauce:
100g of chocolate
100ml heavy cream