For the savory bundt cake, cream the butter and incorporate one egg at a time.
Combine flour, baking powder and salt and mix with the butter mixture. Add enough milk to make a homogeneous batter.
Fry the onions, bacon and the chopped fresh sage leaves in a pan. Add the cheese and mix into the dough.
Grease and flour a bundt pan. Pour in the dough and bake for about 30 minutes in an oven heated to 200°C. Test the dough to see if it is really cooked.