Apple cupcakes

Ingredients:
Filling
1 tbsp butter, melted
4 apples
2 tbsp sugar
2 tbsp water
1/2 tsp cinnamon powder

Cake:
250g butter
150g castor sugar
4 eggs
250 flour
1/2 tsp baking powder
60g milk

Oven temp. 200 C for 20 minutes