Milano cookies - Moje wypieki

Ingredients

• 130 g butter
• 1 ¼ cup icing sugar
• 1 large egg
• 1 egg white (40 g), from a large egg
• 1 teaspoon vanilla extract
• 1 ¼ cups plain flour
• a pinch of salt
• 150 ml whipping cream
• 150 g dark chocolate, chopped