Rub butter all over the inside of the bundt pan. Add a bit of flour and rotate the pan to allow the flour to lightly cover the butter. Do NOT add too much or it will dry out the cake.
In a large mixing bowl add the stick of melted butter, mashed bananas, 2 eggs, ½ cup sour cream, ¾ cup of each sugar, & 2 teaspoons of vanilla. Use a hand mixer to beat on low to medium for 1 minute.
Add the 2 cups of all-purpose flour & 1 teaspoon of baking soda. Mix with the hand mixer on low for 2 minutes. Scrap down the sides a few times to make sure all is incorporated evenly.
Pour the batter in the prepared bundt pan. It will come up about ½ in the pan.Bake in the preheated oven for 40-55 minutes.
Once a toothpick inserted comes out clean, it is done. Let it cool in the pan on a baking rack for 30 minutes.
Carefully invert the pan over a large serving plate. Let it cool for 15 minutes more.
Slice and serve. Top with caramel sauce and whipped cream for a decadent dessert. Also great plain, with ice cream, or served with fresh fruit.
Notes
SUBSTITIONS OR VARITIONS:
use 6 tablespoons of canola oil instead of ½ cup of salted butter