1/3 cup semi-sweet chocolate pieces, melted and cooled
1/2 cup finely chopped nuts
1/2 cup miniature semi-sweet chocolate pieces
1/4 teaspoon rum flavoring
Add To Shopping List
Let's Make It
In a large mixing bowl beat butter and shortening with an electric mixer on medium to high speed for 30 seconds. Add sugar, baking soda, and salt; beat until combined, scraping sides of bowl occasionally. Beat in the egg, milk, and vanilla until combined. Beat in as much of the flour as you can with the mixer. Using a wooden spoon, stir in any remaining flour.
Divide dough in half. Knead the melted chocolate and nuts into half of the dough. Knead the miniature chocolate pieces and rum flavoring into the other half of dough. Divide each portion of dough in half.
To shape dough, line the bottom and sides of a 9x5x3-inch loaf pan with plastic wrap or waxed paper. Press half of the chocolate dough evenly into the pan. Top with half of the vanilla dough, then the remaining chocolate dough, then the remaining vanilla dough, pressing each layer firmly and evenly over the last layer.
Invert pan to remove dough. Peel off plastic wrap or waxed paper. Using a sharp knife, cut dough crosswise into thirds. Slice each third crosswise into 1¿4-inch-thick slices. Place cookies 2 inches apart on an ungreased cookie sheet.
Bake in a 375 degree F oven about 10 minutes or until edges are firm and bottoms are lightly browned. Transfer the cookies to a wire rack; cool.