Step 1

Heat oven to 350°F. Spray 9 (5x3-inch) loaf pans with cooking spray.

Step 2

In large bowl, beat cake mix, pudding mix, milk, oil, 1/4 cup whiskey and the eggs with electric mixer on medium speed 5 minutes. Add 2 cups walnuts; beat 1 minute (batter will be very thick). Divide batter evenly among pans.

Step 3

Bake 35 to 40 minutes or until toothpick inserted in center comes out clean. Remove from oven; place on cooling racks.

Step 4

While cakes are still warm, in another large bowl, beat melted butter, 1 1/2 cups whiskey and the powdered sugar with whisk until smooth. In small bowl, reserve 1 1/2 cups icing for in small bowl; set aside.

Step 5

With bamboo skewer, poke holes in each cake. Pour some of remaining icing over tops of cakes; let soak in 1 minute. Repeat until all icing has soaked into cakes.

Step 6

To reserved 1 1/2 cups icing, add 2 cups walnuts. Spoon walnut mixture over tops of cakes. Cool completely, 45 to 60 minutes.