The Easy Banana Bread Cake Anyone Can Make

Name: The Easy Banana Bread Cake Anyone Can Make
Ingredients: Nonstick cooking spray; 1/2 cup chopped walnuts , plus more for garnish, optional; 1 stick ( 4 ounces ) unsalted butter , melted; 4 medium overripe bananas (about 6 ounces each); 1 large egg; 1 1/4 cups ( 247 g ) packed dark brown sugar; 2 teaspoons vanilla extract; 1 teaspoon baking soda; 1/2 teaspoon kosher salt; 1/2 teaspoon ground cinnamon; 2 cups ( 240 g ) all-purpose flour; 4 ounces ( 113 g ) cream cheese , softened; 4 tablespoons ( 2 ounces ) unsalted butter , softened; 2 cups ( 225 g ) unsifted powdered sugar; 1/2 teaspoon vanilla extract; 1/4 teaspoon kosher salt