Nutella-Banana Coffee Cake

CAKE: 1 c. unsalted butter 3 ¾ c. flour 2 c. sugar 1 T. baking powder 1 ½ t. salt ¼ t. baking soda 1 c. buttermilk 4 large eggs, room temp ¼ c. sour cream 2 t. vanilla FILLING:…

NUTELLA-BANANA COFFEE CAKECAKE:1 c. unsalted butter3 ¾ c. flour2 c. sugar1 T. baking powder1 ½ t. salt¼ t. baking soda1 c. buttermilk4 large eggs, room temp¼ c. sour cream2 t. vanillaFILLING:2 small ripe bananas, peeled and thinly sliced½ c. Nutella¼…