Chocolate Peanut Butter Marbled Banana Bread

from "sugar plum" - http://www.visionsofsugarplum.com/2009/11/chocolate-peanut-butter-marbled-banana.html

• Ready In: 1 hr 20 mins
• Serves: 10
• Yields: 1 loaf

Ingredients

• 2 1⁄3 cups all-purpose flour
• 1  teaspoon baking powder
• 1  teaspoon baking soda
• 1⁄2 teaspoon salt
• 1⁄3 cup  semi-sweet chocolate chips or 1⁄3  dark chocolate chips
• 1⁄3 cup  peanut butter chips
• 2  medium bananas, mashed
• 3⁄4 cup creamy peanut butter
• 1⁄2 cup granulated sugar
• 1⁄2 cup  packed brown sugar
• 2  large eggs
• 1 1⁄2 teaspoons vanilla extract
• 1⁄2 cup milk
• 1⁄4 cup  unsweetened cocoa powder

Directions

1. Preheat oven to 350 degrees F. Grease a 9-inch loaf pan.
2. In a medium bowl, sift together flour, baking powder, baking soda and salt. Whisk in chocolate and peanut butter chips until combined.
3. In a large mixing bowl, using a mixer on medium speed, beat together banana and peanut butter until creamy, about 1 minute.
4. Beat in granulated sugar and brown sugar until creamy, about 1 minute.
5. Beat in eggs and vanilla until combined.
6. Reduce mixer speed to low and gradually beat in flour mixture, alternating with milk, until well combined (about 2 minutes).
7. Divide half of the batter into medium bowl; sift in cocoa powder, and beat until combined.
8. Alternate spoonfuls of banana batter and chocolate batter into the pan. When all the batter is in the pan, swirl a knife sparingly through the batters to marble them. Sprinkle with additional chocolate and peanut butter chips, if desired.
9. Bake for 60-65 minutes or until bread pulls away from pan, is well risen, deep golden brown, and a toothpick inserted comes out with moist crumbs attached. Cool on a wire rack for 1 hour; run a knife around outer edges and invert onto wire rack to cool completely before slicing.