Beat together butter, sugars, eggs, vanilla extract, then mix in flour(with baking soda, baking powder and salt) and sour cream, alternating between the two. Slowly add the rum, and beat well!
Pour batter into greased bundt pan, sprinkled with cinnamon sugar! (It makes for a nice crispy crust) bake at 325 for about 55 minutes, or until golden!
To make glaze, heat butter, rum and vanilla extract in sauce pan, simmer for 3 minutes. Let cool for 15 min, then whisk in powdered sugar! Yummy yummy!
Pour over cooled cake, in a zig zaggy motion!
Ta da!! Delicious cinnamon rum bundt cake!! Mmm mmm good! :)