Caramel Apple Cake

Cake flour 100g, corn starch 20 g, organic baking powder 1tsp, egg 2 pcs, milk 40 c.c., butter 45g, apple sauce 45g, organic cane sugar 70g.
Granny smith 2 pcs, organic cane sugar 4tbsp, rum 1tps.  325F 30 min.