Preheat oven to 350°F and grease a 9x5-inch loaf pan.
In a large bowl, beat together the butter, cream cheese, and sugar until light and fluffy.
Add eggs, mashed bananas, and vanilla extract. Mix well.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Pour the batter into the prepared loaf pan and smooth the top.
For the crumb topping: Combine brown sugar, flour, and cinnamon. Cut in cold butter until crumbly.
Sprinkle the crumb topping evenly over the batter.
Bake for 50-60 minutes, or until a toothpick inserted comes out clean.
Let the bread cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.