Preheat oven to 350° and butter and flour a 9"-x-5" loaf pan. In a large bowl, whisk together flour, baking soda, and salt.
In another large bowl, mix sugar, butter, buttermilk, vanilla, egg and egg yolk until smooth. Pour wet ingredients over dry and stir until combined, then fold in mashed bananas and caramel.
Transfer batter to prepared baking dish and scatter with banana slices. Bake until deeply golden and a toothpick comes out clean, about 1 hour. Let cool at least 10 minutes.
Drizzle with caramel and sprinkle with flaky sea salt before serving.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2018/12/04/salted-caramel-banana-bread/