Grease the bundt pan very well
Preheat the oven to 350 F
Mix together 1 heaping tsp cinnamon with 2 heaping tsps sugar
Sprinkle half the sugar and cinnamon into the bundt pan and set aside
In a medium mixing bowl, cream 2 sticks of butter with 1 1/4 cups sugar
Add 2 eggs and 8 oz sour cream and mix together
Add 1 cup of flour at a time and mix together
Add 2 tsps vanilla and 1 tsp baking soda and mix it together
Pour half the batter into the bundt pan, then pour in the cinnamon-sugar, then the rest of the batter
Bake for 45 minutes
While the bundt cake is baking, make the icing. Mix together the powdered sugar, vanilla, and milk until it is thin
Once the bundt cake is done baking, take it out and wait for it too cool before turning upside down and removing it from the bundt pan
Top with icing