The Best Pineapple Upside-Down Cake

unsalted butter3/4 cup light brown sugar, packed

pineapple slices

about 12 maraschino cherries

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 is okay (plain Greek yogurt may be substituted)

canola or vegetable oil

vanilla extract