1/4 cup plus 3 tbsp. butter
1/4 cup plus 3 tbsp. sugar
1 egg, beaten
3/4 cup plus 2 tbsp. flour
1 can sweetened condensed milk
Cream together butter and sugar; add egg and flour and mix well.
In scant teaspoonfuls, drop onto a cookie sheet. Pat with a floured finger into very thin 1.5-inch circles.
Bake at 325 degrees for 10-12 minutes, until just starting to brown around edges.
Sandwich two cookies together with cooked condensed milk. To cook condensed milk, place entire, unopened can in a large saucepan, cover with water. Bring to boil and simmer about 2 hours. This turns it into caramel.