Stir the butter until foamy and gradually add sugar, eggs and salt. Mix flour and baking powder and stir in. Pour the dough into a round 26-28 mm spring form. Spread the apricots or peaches on top with the curve facing up. Bake at about 180 ° C for about 30 minutes on the middle rack. Sprinkle with cinnamon sugar.
With fresh apricots, lightly add sugar to the fruit before baking, as they will be slightly sour.