Preheat over to 375 degrees. Place liners into muffin pan.
Place the first 7 ingredients into a large mixing bowl; mix well. Add in the oats and raisins; stir to combine. Begin to heat water to a boil paying attention as to not over-boil and lose some water through evaporation.
In a separate bowl, stir in the buttermilk, oil, vanilla and egg; blend well. Pour into the dry ingredients and stir until just combined, avoid over-mixing.
Pour in boiling water and stir in to blend water with other ingredients. Allow batter to sit for 15 minutes.
Fill muffin cups with an even amount of batter and then bake for 20 minutes or until a toothpick inserted comes out clean.
Remove from pan and allow to cool on the counter or on a wire rack.