A heavenly moist and fluffy cake that tastes like home:

For the cake
300 g butter (melted)
300 g confectioners’ sugar
1 Tbsp vanilla sugar
½ Tsp salt
Grated lemon zest from 1 lemon
5 eggs
300g all-purpose flour
2 Tsp baking powder

For the topping
3 apples (peeled and cut into thin slices)
1 Tsp cinnamon
½ cup oatmeal
½ cup all-purpose flour
½ cup brown sugar
½ Tsp baking powder
½ cup butter (melted)

Preheat oven to 160 °C. Line a baking pan with a baking sheet or butter and flour a baking pan of approximately the same size. Mix butter, sugars, salt and lemon zest until fluffy. Add eggs one by one stirring in-between. Mix with flour and baking powder until just combined. Pour into pan and spread evenly (about 2 cm high). Mix apple slices and cinnamon and arrange on patter in pan. Mix rest of the ingredients and evenly spread over the apples. Bake for 40 minutes or until inserted toothpick comes out clean. Let cool and cut into squares.