PREHEAT oven to 400°F. Combine flour, sugar and baking powder in large bowl; set aside. Beat egg, juice and butter in small bowl with wire whisk until well blended. Add to flour mixture; stir just until moistened. (Batter will be lumpy.) Stir in cookies.
SPOON evenly into 12 greased medium muffin cups.
BAKE 15 to 20 min. or until lightly browned. Serve warm.
