Marbled-Chocolate Banana Bread

Marbled-Chocolate Banana Bread(Adapted from CL)

1/4 cup butter, softened
1 cup sugar
2 cups all-purpose flour, sifted
3/4 teaspoon baking soda
1/2 teaspoon salt
1 1/2 cups mashed very ripe bananas
2 large eggs
1 teaspoon vanilla
1/3 cup plain low-fat yogurt
1/2 cup semisweet chocolate chips
Cooking spray

Preheat oven to 350

Place sugar and butter in a large bowl; beat with a mixer at medium speed until well blended (about 1 minute). Add banana, eggs, vanilla, and yogurt; beat until blended.

In a medium bowl, combine the flour, baking soda, and salt, stirring with a whisk. Add flour mixture to the butter/sugar mixture and beat at low speed just until moist.

Place chocolate chips in a medium microwave-safe bowl, and microwave at HIGH 1 minute or until almost melted, stirring until smooth. Cool slightly. Add 1 cup batter to chocolate, stirring until well combined. Spoon chocolate batter alternately with plain batter into an 8 1/2 x 4 1/2-inch loaf pan coated with cooking spray. Swirl batters together using a knife.

Bake at 350 for 1 hour and 15 minutes or until a wooden pick inserted in center comes out clean. Cool 10 minutes in pan on a wire rack; remove from pan. Cool completely on wire rack.