The night before (or up to 2 days) either prepare your oatmeal or place the oats and buttermilk into a bowl. Cover and let sit overnight. This is also a good time to make the walnut butter.
The next morning, mix in the eggs, vanilla, sugar. and oil to combine. If you used leftover oatmeal, you will need to add a touch of any preferred milk to get the desired batter consistency. I used about 1/2 cup.
Whisk together the dry ingredients, then incorporate into the wet. This will be a thick pancake batter consistency.
In a greased, preheated pan over medium low heat, pour about 3 tablespoons batter into the pan. When bubbles begin to form evenly and the bottom is golden, flip and cook the other side. Repeat with the remaining batter, serve with the walnut butter if you like.