Beat everything to mix the ingredients. Pour the mixture into heart-shaped cake forms, and if necessary, butter and flour them. Bake in a preheated 338°F (170 °C) oven for about 15-20 minutes (or more, depending on your oven).
The important thing is for the baked hearts to remain moist, not dry. Let the hearts cool and remove them from the forms. Prepare a topping by melting the crushed chocolate in milk and adding the butter and cocoa.
Pour this chocolate sauce over the hearts and leave them for 1-2 hours in the refrigerator.