Place on lightly greased baking sheet. Mix 1/4 cup milk and the egg together and lightly brush the tops of the pastries. Sprinkle with sugar.
Bake at 400° for 10-12 minutes. Cool on wire rack.
In saucepan mix 1 cup milk and flour. Over medium heat, bring to a boil for 1 minute or until mixture thickens. Cool. Empty milk-flour mixture into mixing bowl. Add butter, sugar, salt and flavorings. Beat 10 minutes until light and airy. Split pastries in half. Put 1 Tablespoon of mixture on the bottom of each pastry and replace the top. Refrigerate.