Lemon cake - Moist light and aromatic

Ingredients

• 200 g butter
• 4 large eggs at room temperature
• zest and juice of 1 lemon
• 200 g powdered sugar
• 1 tablespoon vanilla extract
• 1 teaspoon of lemon flavor
• 150 g wheat cake flour
• 100 g potato flour
• 1 teaspoon baking powder
• 1 tablespoon butter
• 4 tablespoons bread crumbs
• 1 cup powdered sugar
• 1 tablespoon lemon juice
• 1 egg white