Polish Carpathian Mountain Cream Cake (Karpatka)

Ingredients:
For the cake:
1/2 cup of butter
1 cup of water
1 cup of flour
5 eggs
1 tsp of baking powder
1/4 tsp of salt

For the cream:
1 cup of butter
4 cups of milk
1 cup of sugar
5 tbs of white flour
5 tbs of corn starch
5 egg yolks
2 tsp of vanilla extract

For decorating:
icing sugar

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