Chocolate Ribbon Banana Loaf

In a large bowl, beat butter and sugar until crumbly.

Add eggs, one at a time, beating well after each addition. Beat in the bananas, yogurt and vanilla.

Combine the flours, baking soda, salt and cinnamon; gradually add to butter mixture just until moistened. Fold in peanut butter chips.

Remove 1 cup batter to a small bowl; stir in chocolate until well blended.

Pour half of the remaining plain batter into a 9-in. x 5-in. loaf pan coated with cooking spray; top with half of the chocolate batter. Repeat layers.

Cut through batter with a knife to swirl.

Bake at 350° for 40-50 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack.