Combine oats and buttermilk in a large bowl; stirring until oats are moistened by the buttermilk. Refrigerate and let sit for one hour.
Pre-heat oven to 400° F.
To the oat/buttermilk mixture add egg and mix well. Stir in brown sugar, maple syrup, vanilla extract, and canola oil. Stir until well combined.
In a separate bowl combine whole wheat flour, all-purpose flour, salt, baking powder, cinnamon, and baking soda. Stir this mixture into the wet ingredients until the dry ingredients are completely moistened. Fold in raisins and pecans.
Prepare 12 muffin cups. Divide the batter equally between the muffin cups. They will be nearly full.