Melt the butter in a rectangular tray. Arrange the biscuits on top.
Separately, peel and cut the apples into crescents.
Roll them in the cinnamon and arrange them on top of the melted butter and biscuits in the tray.
Pour the mixture on top of the apples.
Bake the cake in a preheated 356°F (180 °C) oven.
Sprinkle the ready cake with powdered sugar.