1. Pre-heat oven at 3750F.
  2. In a bowl, combine finely chopped nuts, flour, powdered sugar, vanilla and softened butter. Mix until well blended and crumbly.
  3. Form dough into balls, place on ungreased cookie sheets. Bake in pre-heated oven for 10 – 12 minutes or until set but not brown.
  4. Remove from cookie sheet, cool slightly and roll into powdered sugar while still warm. Let cookies cool completely.
  5. To make Dulce de Leche: Pressure cook condensed milk for 25 minutes or 4 hours under high heat in the stove top.
  6. Once cookies have cooled, divide cookies into 2 set. Spread about half a teaspoon of Dulce De Leche on one set of the cookies. Sandwich the filling with another piece of the cookie.