Preheat the oven to 325°F/165°C (Deb's version 350, start checking cake at 45 minutes)
Grease a 10″ bundt pan with butter or shortening very liberally. Dust the pan with flour and set aside.
Cream butter and sugar with mixer until light about 2 minutes
Add eggs one at a time and mix well after each addition
Add vanilla, baking powder, baking soda, and mix to combine about 1 minute
Add flour and sour cream or buttermilk, alternating. Start with flour and finish with flour
Pour the batter into the prepared pan and bake for ~65 minutes until a toothpick entered into the center comes out clean.
When the cake is done make the glaze. Combine all ingredients into a small saucepan over medium-low heat. Stir continuously until the butter is melted and the sugar is dissolved. Do not bring to a boil.
Remove cake from pan and then put it back in pan to glaze cake. This helps keep the cake from sticking after glaze.
Poke holes all over the warm cake using a knife or skewer or skinny chopstick and pour the glaze evenly on the cake while still in the pan.
Allow the cake to cool completely in the pan and then invert the cake onto a serving plate.
Make this cake a day in advance, so the syrup has time to infuse the cake.