1/2 c. melted butter, plus more butter for pan
1 c. plus 2 tbsp. all-purpose flour, divided, plus more for pan
1 tsp. baking soda
1/4 tsp. kosher salt
3/4 c. plus 2 tbsp. sugar, divided
1/4 c. buttermilk
1 tsp. pure vanilla extract
2 large eggs plus 1 large egg yolk, divided
3 ripe bananas, mashed
4 oz. cream cheese, softened
Preheat oven to 350° and butter and flour a 9″-x-5″ loaf pan.
In a large bowl, whisk together 1 cup flour, baking soda, and salt.
In another large bowl, combine 3/4 cup sugar, butter, buttermilk, vanilla, 1 egg and egg yolk and mix until smooth. Pour wet ingredients over dry and stir until combined, then fold in mashed bananas.
Make cream cheese filling: In a small bowl, stir together remaining egg, cream cheese, and remaining 2 tablespoons each flour and sugar.
Transfer half the batter to prepared pan. Dollop cream cheese filling on top and smooth in an even layer with a spatula. Top with remaining batter and bake until deeply golden and a toothpick comes out clean, 1 hour. Let cool at least 10 minutes before serving.