Place cookies on cooling racks. Let cool completely.
Pulse pecans in food processor until crumbly.
Heat chocolate chips in microwave safe bowl for 30 sec.
Stir chocolate and heat in 15 sec. intervals until melted.
Mix in shortening and heat additional 10 sec.
Spoon melted chocolate into ziplock bag and cut off tip. (Chocolate will run out quickly so be ready to drizzle over cookies immediately.)
Drizzle chocolate over cookies and sprinkle with nuts before chocolate hardens. (This may take two people to accomplish since the chocolate will harden quickly.)