Using a medium mixing bowl, mix together the chopped walnuts, brown sugar, and cinnamon until combined
Preheat the oven to 300 degrees and spray a 9-inch Bundt cake pan with baking spray, set aside
Using a large mixing bowl, whisk together the flour, baking soda, and salt until combined.
Using a standing mixer, beat together the butter and sugar until light and fluffy.
Add in the eggs, one at a time until combined after each egg. Beat in the sour cream, vanilla, and whiskey until combined. Gradually beat in the dry ingredients until combined.
Scoop 1/3 of the batter into the Bundt pan and sprinkle half of the walnuts on top of the batter. Spoon another 1/3 of the batter on top of the walnuts and smooth evenly.
Sprinkle the remaining amount of walnuts. Smooth the remaining amount of batter.
Bake in the preheated oven for 70 minutes or until a toothpick comes out clean.
Allow cooling for 15-20 minutes before removing and placing onto a serving plate. Dust with powdered sugar.
Enjoy!