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HEAT oven to 375°F.
COMBINE first 5 ingredients in large bowl. Whisk peanut butter and milk in medium bowl until blended; stir in bananas, egg, oil and vanilla. Add banana mixture to dry ingredients; stir just until moistened.
SPOON into 12 muffin cups sprayed with cooking spray.
BAKE 18 to 20 min. or until toothpick inserted in centers comes out clean. Cool slightly.