Blueberry Oatmeal Pie

Bottom

200 g butter

1 1/4 dl sugar

1 egg

4 dl flour

1 tsp baking powder

3/4 dl milk

Topping

200-300 g blueberry

1 1/2 tbsp potatostarch

1/2 dl icing sugar

100 g butter

1/2 dl sugar

1 tsp vanilla sugar

1 tsp baking powder

3 dl oatmeal