Dough
3 c flour
2 ½ t baking powder
1 t salt
½ c brown sugar
¾ c butter or margarine, softened
½ c milk
1 t vanilla
1 egg, slightly beaten
Filling
1 can sweetened condensed milk
1 pkg chocolate chips, semi-sweet
1 c chopped walnuts
Combine flour, baking powder, salt, and brown sugar in a bowl. Cut in the butter or margarine. Add the milk, vanilla, and egg. Knead into a soft dough. Divide the dough into three equal parts. Roll out each between floured pieces of waxed paper into rectangles. Spread a third of the filling mixture over dough to within 1” of edges. Flip in shorter edges first, then, using the waxed paper, fold over longer edges to center, sealing seam with milk. Flip onto greased cookie sheet, seam side down. Decorate with colored sugar, if desired. Bake at 375 for 15-20 minutes. Do not remove from cookie sheet until completely cooled. These freeze well. Cut into slices when ready to serve.
To make filling, combine all ingredients in a double boiler until melted.