Soda put in yogurt to boil. Add the sugar, the oil and cocoa. Stir well and then add the flour. Stirring until ready and pour the mixture into a buttered baking dish. Bake the base in heated to 180-200 C oven until ready. The cream is prepared according to package directions, then add gradually and chocolate until chocolate cream. When the base has cooled down, cut it with a very sharp knife into 2 halves (2 the base). Put a base in a suitable plateau and cream. Top and put the other base and again cream top and sides.