Preheat the oven at 160 ‘C fan forced. Line a 22cm round cake tin. Combine flour, baking powder, baking soda, salt, cardamom powder in a medium bowl. Set aside.
Whisk soft butter and sugar until light and creamy. Add eggs at a time and beating the mixture well. Add in the zest. Stir in the flour and sour cream alternatively until well combined into a smooth batter.
Pour the batter into the prepared pan. Arrange the sliced apples. Bake them in a preheated oven for 35 minutes or until golden brown.