Preheat the oven to 160°C, peel the apples, and cut them into cubes.
Whip butter and sugar until light in color and then add eggs, flour, and baking powder. Combine.
Grease a cake tin with a layer of salted butter and add the cake mix.
Press pieces of apple into the mix and sprinkle sugar and cinnamon on top.
Bake for 45-60 minutes.