Preheat oven to 350°F. Combine flours, baking powder, and baking soda in medium bowl; set aside. Whisk agave syrup, Greek yogurt and egg in medium bowl. Beat in bananas and vanilla until blended. Stir in flour mixture; beat until just blended. Stir in nuts. Pour into 9 x 5-inch baking pan sprayed with nonstick cooking spray. Bake 55 to 65 minutes or until wooden pick inserted in center comes out clean. Cool in pan 10 minutes.
