Melt half of the chocolate bits in a microwave or double boiler.

Cream together the shortening and sugar until light and fluffy.

Add the egg and beat until well combined.

Stir in the vanilla and melted chocolate.

Gradually add the milk and dry ingredients (flour, baking powder, and salt) to the wet ingredients.

Mix until just combined.

Fold in the remaining chocolate pieces and black walnuts, if using.

Drop by rounded teaspoons onto an ungreased cookie sheet.

Bake in a preheated oven at 350°F (175°C) for 13 to 15 minutes, or until golden brown around the edges.

Let cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.