Pre-heat oven to 350°.
Cream butter and sugar.
Add eggs and vanilla, mixing well.
Sift all dry ingredients together. Stir into creamed mixture alternately with milk, beginning and ending with dry ingredients. If batter is too thin, you may add more flour.
Drop from teaspoons onto baking sheet.
Bake at 350° for 10 to 12 minutes.
When fully baked, remove from cookie sheet and allow to cool on wire rack.
Mix icing together until good consistency, not too runny or the cookies will slide apart.
Put cookies together with icing to form sandwich cookies.
Serve and enjoy!