Spread the cookie dough out on a cookie sheet to 1/4-inch thickness (about 9 inches by 12 inches) using your fingertips. Bake for 25 minutes. Let cool.
Spread the marmalade over the cookie. Sprinkle with nuts.
In a double boiler over very lightly simmering water, melt the chocolate. Dip a spoon in the melted chocolate and drizzle on top of the cookie. Let cool. Cut the cookie into 12 bars or squares. Serve or store in an airtight container.