Chocolate cake with espresso aroma

Ingredients

• 225 gr flour for every use
• 3/4 of a tablespoon of baking powder
• 3/4 of a tablespoon of baking soda
• 1/4 of a tablespoon of salt
• 1 spoon of espresso coffee
• 1 tablespoon of liquid vanilla
• 315 gr of stirred, strained yoghurt
• 90 gr of unsalted butter
• 35 gr of sugar
• 2 eggs
• 90 gr of melted, plain chocolate
• Some orange zest