Created by KittenCal on October 5, 2013
Step 1: Preheat oven to 350 degrees F.
Step 2: Generously great a 12-cup bundt pan or greased 10-inch tube pan.
Step 3: In a large bowl cream the butter and 2 1/2 cups sugar until fluffy.
Step 4: Add the vanilla; add the eggs, one at a time, beating well after each addition. Then continue beating for 3 minutes at high speed (this is important to beat for no less than 3 minutes!).
Step 5: Combine the flour, baking powder, baking soda, and salt; add to the creamed batter alternately with sour cream, beating until smooth.
Step 6: Spoon one-third of the batter into a greased tube pan.
Step 7: For the cinnamon filling; combine the cinnamon, nuts and 3/4 cup sugar; sprinkle one-third over batter in pan.
Step 8: Repeat layers two more times.
Step 9: Bake for 60-70 minutes or until cake tests done.
Step 10: Cool for 10 minutes; remove from pan to a wire rack to cool completely.