Chocolate-Nut Freezer Cookies

1/3 c. butter, softened
1/3 c. shortening
1/2 c. sugar
1/2 c. firmly-packed brown sugar
1 egg
2 oz. semisweet chocolate, melted
1 T. milk
1 t. vanilla
2 c. flour
1 t. baking powder
1/2 t. salt
1 c. chopped pecans

Cream butter and shortening; gradually add sugars, beating well at medium speed with electric mixer. Add egg, melted chocolate, milk, and vanilla, beating well. Combine dry ingredients; add to creamed mixture, mixing well. Stir in pecans. Shape dough into two 9" logs. Cut dough into 1/4" thick slices, and place on ungreased cookie sheets. Bake at 350° for 8 to 10 minutes. Transfer cookies to wire racks to cool completely.