Banana Upside-Down Cake

Name: Banana Upside-Down Cake
Prep time: 45 min
Cook time: 45 min
Total time: 45 min
Yield: 6
Cuisine: Global
Ingredients: 1 teaspoons baking powder; 1 teaspoons baking soda; 2 larges ripe bananas, sliced; 237 milliliters firmly packed light brown sugar; 118 milliliters buttermilk; 355 milliliters cake flour; 2 eggs; 1 teaspoons salt; 296 milliliters sugar; 6 Tbsps (3/4 stick) unsalted butter, room temperature; 1 teaspoon vanilla extract; 79 milliliters vegetable shortening