In a medium bowl, whisk together the oats, flour, brown sugar, baking powder, baking soda, and cinnamon. In another bowl, whisk together buttermilk, eggs, melted butter and vanilla, blend thoroughly. Pour the liquid ingredients over the dry ingredients and mix with the whisk until just combined. Don't worry if the batter is a bit lumpy. With a rubber spatula gently fold in the raisins. The batter will thicken as it stands.

If necessary, lightly butter, oil, or spray your griddle or skillet. Preheat over medium heat or if using an electric griddle set to 350 degrees F. If you want to hold the pancakes until serving time preheat your oven to 200 degrees F. Spoon 1/4 cup of batter onto griddle for each pancake, allowing space for spreading, and use a spatula or the back of your spoon to lightly press the batter into rounds. When the underside of the pancake are golden and the tops are speckled with bubbles that pop and stay open, flip over with a wide spatula and cook on the other side until light brown. Serve immediately or place in oven while you make the rest of the batch.