Banana Coffee Cake with Pecans

Step 1
Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9-inch square baking dish.

Step 2
Beat superfine sugar and butter in a bowl with an electric mixer until smooth. Add eggs one at a time, beating until each egg is fully incorporated before adding the next. Mix baking soda into sour cream in another bowl and stir into butter mixture until combined.

Step 3
Stir bananas into butter mixture; add cake flour and baking powder and mix well. Stir in vanilla extract. Pour banana cake batter into prepared baking dish.

Step 4
Mix pecans, brown sugar, and cinnamon in a bowl; sprinkle over cake batter.

Step 5
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 45 minutes.