Preheat oven to 400 degrees F. Spray 18 medium muffin cups with non-stick cooking spray or line with paper baking cups.
Combine flours, oats, baking powder, sugar and orange rind in large bowl; mix well. Combine egg, sour cream, vegetable oil and orange juice in medium bowl; mix well. Add all at once to dry ingredients. Mix only until blended. Gently stir in raisins. Spoon batter into prepared muffin cups filling almost full.
For topping, combine oats, brown sugar, orange rind and butter in small bowl; mix well. Sprinkle over muffin batter, dividing evenly and patting gently.
Bake 20 to 25 minutes, until wooden pick inserted in center comes out clean.