1. Heat oven to 400°F Line 12 medium muffin cups with paper baking cups. For topping, combine 1/4 cup oats and brown sugar; set aside.
2. For muffins, combine 1-1/2 cups oats with remaining dry ingredients in large bowl; mix well. In small bowl, combine milk, egg whites, oil, lemon peel and vanilla; mix well.
3. Add to dry ingredients; stir until moistened. Gently stir in berries. Fill muffin cups almost full; sprinkle with topping.
4. Bake 20 to 24 minutes or until light golden brown. Cool muffins in pan on wire rack for five minutes; remove from pan. Serve warm.