This sour cream banana pound cake is moist, rich, dense, and packed with delicious ripe banana flavor. Topped with a simple brown sugar glaze and walnuts, every bite is as incredible as the last.
Preheat. Preheat the oven to 325°F. Grease and flour a 12-cup Bundt pan. Set aside.
Cream butter and sugar. In a large mixing bowl, beat the butter and granulated sugar until light and fluffy.
Add eggs. Add the eggs one at a time, beating well after each addition.
Add bananas. Mix in the mashed bananas and vanilla extract until combined.
Combine dry ingredients. In a separate bowl, whisk together the flour, baking soda, baking powder, salt, and ground cinnamon.
Finish batter. Add the dry ingredients to the wet mixture alternately with the sour cream, mixing just until incorporated.
Bake. Pour the batter into the prepared Bundt pan and bake for 75 to 85 minutes, or until a toothpick inserted into the center comes out clean.
Cool. Let the cake cool in the pan for 10 minutes, then invert onto a wire rack to cool completely.
Make glaze. Melt the butter in a small saucepan over medium heat. Stir in the brown sugar and cook until dissolved, about 3 to 5 minutes. Remove from heat and cool for 5 minutes. Whisk in the vanilla extract and milk. Transfer to a bowl and beat in the powdered sugar until smooth.
Glaze cake. Pour the glaze over the cooled cake and sprinkle with walnuts if using. Let set for 10 to 15 minutes before slicing.
Notes
Pan size. Use a 12-cup Bundt pan to prevent overflow.
Egg technique. Adding eggs one at a time helps incorporate air for proper pound cake texture.
Add-ins. Up to ⅓ cup chopped walnuts can be mixed directly into the batter.
Storage. Store covered at room temperature for up to 1 week. Freeze unglazed cake for up to 2 months.