Using a double boiler, melt the chocolate in a medium size bowl.
Add the milk and stir until the mixture thickens, approximately 5 minutes.
Remove the bowl from heat and add the crumbs, salt, nuts, and vanilla and stir until well combined. Work quickly as the mixture will become stiff. Using a spoon, drop the mixture into rounded teaspoons onto a prepared greased cookie sheet.
Place 1/2 a walnut on top of each cookie.
Place cookies in oven and bake for 10 minutes.
Remove cookies from oven and quickly transfer onto waxed paper to cool.