To prepare the chocolate cake without baking powder start creaming the butter and sugar together.
Add the eggs, one at a time, followed by the yogurt.
Incorporate the melted chocolate and, in the meantime, mix the flour, cocoa powder and baking soda together in a separate bowl.
Add the dry ingredients, thoroughly sieved, to the liquid mixture.
If the mixture is too thick, add 50 ml of milk.
Mix everything thoroughly and pour it into a cake tin, previously greased with butter and sprinkled with a little flour.
Bake in the oven at 180°C for approximately 60 minutes: now you can enjoy your chocolate cake without baking powder.