Preheat oven to 425° F. In a large bowl combine the oat bran cereal, baking powder and raisins. Stir in the honey. Mix the milk, egg whites and oil together and blend in with the oat bran mixture. Line muffin pans with paper baking cups, and fill with batter. Bake 15 minutes. Test for doneness with a toothpick; it should come out moist but not wet. Makes 24 muffins.