1. Add oats and buttermilk to large mixing bowl. Let stand for 1 hour.
  2. Preheat oven to 400 degrees. Line 12 muffin cups with paper or foil liners.
  3. Add egg, brown sugar, syrup, vanilla, and canola oil to oat mixture in mixing bowl. Stir until just combined.
  4. In another large bowl, whisk together flours, salt, baking powder, cinnamon, and baking soda. Stir into oat mixture until just combined. Fold in raisins.
  5. Spoon batter into prepared muffin cups using a 1/4-cup measuring cup and bake until golden (about 20 minutes).
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