Scald milk with vanilla.

In a saucepan, combine sugar, flour, salt and egg yolks, stirring until well blended. Add milk gradually.

Cook over low heat, stirring constantly without scraping the bottom of the pan. Bring to a boil and continue boiling for 3 minutes.

Pour into a bowl and allow to cool, stirring occasionally.

In a heavy saucepan, combine water, butter, salt and sugar. Bring to a boil.

Remove from heat and add flour at once. Stir briskly with a wooden spoon until dough is smooth.

Return to heat and cook, stirring constantly, until dough leaves the side of the pan and forms a ball.

Remove from heat and add eggs one at a time, mixing after each addition.

Spoon dough onto a greased baking sheet and bake at 375°F for 45 minutes, or until puffs are dry and golden. Cool, split and fill with cream.