Place 1/2 cup chocolate morsels in top of a double boiler; bring water to a boil. Reduce heat to low; cook until chocolate melts. Set aside to cool. Combine flour, baking powder, and salt; set aside. Cream shortening; gradually add sugar, beating well at medium speed of an electric mixer. Add cooled chocolate, egg, and vanilla; beat well. Add milk, mixing well. Add dry ingredients, and mix well. Stir in remaining 1/2 cup chocolate morsels and walnuts. Drop dough by heaping teaspoonfuls onto lightly greased cookie sheets. Bake at 350 degrees for 10 minutes or until done. Carefully transfer cookies to wire racks to cool