heat oven to 350. spray. 9 x 5 inch loaf pan with cooking spray

in medium bowl, mix flour,baking soda. and salt; set aside.

in large bowl, beat butter and sugar with electric mixer on medium speed until well blended. Add eggs, one at a time,beating well after each addition. Add bananas, yogurt, and vanilla; beat until blended. Add flour mixture, beat at low speed just until flour is incorporated. (do not overmix)

Spoon hazelnut spread into medium microwavable bowl. Microwave uncovered on High about 15 seconds or until softened. Stir in 1 cup of the banana bread batter until well blended. Spoon 1/3 of the PLAIN banana bread batter into loaf pan, top with half of the hazelnut batter; repeat layers ending with plain banana batter on top. insert knife into batter and swirl lightly.