Step 1

Preheat oven to 350 degrees F (175 degrees C). Grease a loaf pan with cooking spray.

Step 2

Combine sugar and butter in a large bowl; beat with an electric mixer until creamy. Beat in bananas and eggs.

Step 3

Mix 1 1/2 cup plus 3 tablespoons cake flour, baking soda, and salt together in a bowl. Mix into the banana mixture. Stir in vanilla extract. Pour half of the batter into the prepared pan.

Step 4

Heat cookie spread in the microwave until softened, about 20 seconds. Spread over the batter in the pan. Cover with remaining banana batter; swirl decoratively with a knife.

Step 5

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 50 to 60 minutes. Cool in the pan for 5 minutes. Invert onto a wire rack. Cool for 10 to 15 minutes before serving.