Preheat oven to 350°F and oil a 12 serving muffin pan or line with paper cups.
In a large bowl, combine the oil, eggs and milk. In a separate bowl, combine the flours, baking powder, sugar, salt and cinnamon. Add the raisins to the dry mix and toss to coat.
Add the dry ingredients to the wet and fold together, being careful not to overmix.
Pour the batter into the prepared cups, filling 3/4 full. Top each muffin with 1 tablespoon of streusel topping.
Bake at 350°F for 20-22 minutes until golden and the tops spring back when lightly touched. Serve warm or at room temperature.
Streusel
Combine the flour, sugar, oats, cinnamon and salt in a large bowl. Add the melted butter and mix until large clumps form. This can be made a day ahead and stored, covered, in the refrigerator.