Absolutely delicious, mouth-watering grandma’s nut stores πŸ˜‹

Ingredients
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Dough
1 medium egg
80 g sour cream
150 g butter, room temperature
50 ml oil
40 g cornstarch or potato starch
300 g flour
1 tsp baking powder
1 packet vanilla sugar
Filling
2 small apples
100 g ground walnuts
2 tbsp sugar
1 tsp ground cinnamon
Preparation