Chessboard Cake with Apples and Pudding

🧾 Ingredients
For the sponge base:

4 eggs

120 g sugar (½ cup)

100 g flour (ž cup)

1 tsp baking powder

Pinch of salt

For the pudding cream:

2 packs vanilla pudding powder (or custard mix)

800 ml milk

80 g sugar (⅓ cup)

200 g butter, softened