Heavenly Banana Foster Upside-Down Cake

HEAVENLY BANANAS FOSTER UPSIDE-DOWN CAKE1 c. firmly packed light brown sugar1/3 c. plus ¼ c. butter, softened and divided2 T. dark rum3 ripe bananas, sliced ¼”thick, crosswise¾ c. sugar2 T. canola oil2 eggs2 c. flour2 t. baking powder½ t. kosher…