Cream together the butter, brown sugar, egg, and vanilla. Add the flour, baking powder, and salt. Mix well.
In a microwave safe bowl melt the chocolate and let cool slightly. Mix in the baking soda.
Remove 2/3 of the cookie dough to a floured surface. Blend the chocolate and soda mixture into the remaining 1/3 of the dough.
Roll out 1/2 of the light dough into a 16″ x 4″ strip. Shape 1/2 of the chocolate dough into a 16″ long snake and place in the center of the light dough. Mold the light dough around the chocolate and wrap in foil. Repeat with the remaining dough and chill for 2 hours or up to 5 days.
Cut the dough into slices approximately 1/4″ thick. Put two slices together (dampen the touching edges). Pinch the corners to create “ears”. Place two chocolate chips in the center of the dark dough to create eyes and a whole cashew in the center for the beak.
Bake at 350 degrees for 8-12 minutes or until edges are very slightly browned. Check often. Cool completely and store in airtight container.