Mix all the dry ingredients in a large bowl. Gradually add the wet ingredients: eggs, Milko kefir or Milko natural buttermilk, cooled melted Łaciate extra butter. Bring together into a uniform and smooth batter. Choose your favourite form adequate for a medium-sized cake. Prepare it for baking: line with baking paper or grease with Łaciate extra butter, then sprinkle with breadcrumbs. Pour in the batter. Put the form in the oven preheated to 180°C and bake for about 45-60 minutes. When your cake is ready, leave to rest in the oven for about 15 minutes. Serve with a dash of caster sugar and swirls of whipped cream: https://www.mlekpol.com.pl/index.php?option=com_content&view=article&id=1232&Itemid=1114 or a scoop of ice cream.