Biscota thipla me marmelada (sandwich cookies w/marmalade)

3 c  flour
      3 ts baking powder
      4 ea Eggs, separated
      1 c  Sugar
      1 ts vanilla
    1/2 c  butter, melted
      1 c  Milk
    1/2 c  blanched almonds
      2 c  Apricot marmalade
 
     Sift flour with baking pwdr. into a bowl; make well in middle of it. In
  another bowl, beat egg yolks with sugar and vanilla, then pour into flour.
  Add melted butter.  Knead mixture into soft dough, slowly adding the milk
  as you knead.  Let dough rest for 10 min.
  
     Separate dough into 4 parts and roll each out a quarter inch thick; cut
  into rounds, and place carefully on buttered cookie sheet.  Beat egg whites
  lightly, brush over cookies; press 1/2 an almond into center of each. Bake
  in preheated 300 F. oven for abt. 15 min.  Remove from oven and cool. Spoon
  some marmalade onto half the cookies and top them with the others. Serve
  immediately.