Caramelized Banana Upside-Down Cake

unsalted butter (1 stick)

light brown sugar, packed

about 3 extra-large ripe bananas or 4 small/medium, sliced in half horizontally and then sliced in vertically (if banana is ‘fat’, slice each half into 3 or 4 long vertical pieces)

cup all-purpose flour

granulated sugar

baking powder

salt, optional and to taste

large egg

buttermilk (or Powdered Buttermilk, use 2 tablespoons with the dry ingredients + 1/2 cup water added with the wet)

sour cream (lite okay, or plain Greek yogurt may be substituted)

canola or vegetable oil

vanilla extract

salted caramel sauce for drizzling, optional (homemade or storebought)