Mix egg and fat in a mixing bowl until creamy. Add buttermilk and stir in. Mix flour, baking powder, 25 g sugar and salt and stir into the egg-buttermilk mixture. Wash the apple, rub dry and cut into 6 slices.
Remove seeds with a knife. Brush the pan with oil and heat it up. Put apple slices into the pan. Add 1-2 tablespoons of dough to each slice and spread it with the spoon base on the apple slice until it is completely covered.
Bake the pancakes on each side for about 2 minutes until golden brown, take them out and let them drain briefly. Mix 10 g sugar and cinnamon. Serve pancakes with sour cream and cinnamon sugar. Decorate with apple wedges.