1. Preheat oven to 350°F and set aside a greased 9.5” bundt pan.

Prepare Filling

1. In a bowl, stir together all ingredients until thoroughly combined. Set aside.

Prepare Cake Batter

1. In a large bowl, beat butter and sugar on medium high speed until light and fluffy, about 3 minutes.
2. Add eggs, one at a time, mixing completely after each addition.
3. Reduce speed to medium, and add bananas, sour cream, and vanilla. Mix until thoroughly combined.
4. Reduce speed to low, and add all-purpose flour, baking soda, and salt, and mix until just combined.
5. Pour one-third of the batter into the prepared pan. Sprinkle half of the prepared filling evenly over the batter. Repeat this layering process with the remaining batter and filling.
6. Bake until a toothpick inserted near the center comes out clean, about 55 to 75 minutes. Cool in the pan for 15 minutes, then transfer to a wire rack to cool completely.

Prepare Glaze

1. In a small bowl, whisk together powdered sugar and vanilla. Whisk in milk or cream, one teaspoon at a time, until desired consistency is reached.
2. Gently pour glaze over cooled cake.