Make oat flour: add rolled oats to blender or food processor and pulse until ground into a fine flour-like texture (about one minute). Remove oat flour from blender.
Add milk, pumpkin puree, eggs, butter, maple syrup, and vanilla extract to blender and pulse until smooth and uniform. (Alternatively, add ingredients to a large mixing bowl and stir to combine by hand.)
Add oat flour, flax meal, protein powder, cinnamon, baking powder, and sea salt to liquid mixture and pulse or mix until combined and no dry pockets remain. Batter will be very thick.
Melt oil or butter in a large skillet or griddle over medium high heat.
Scoop about ⅓ cup of batter into pan to form each pancake. Gently tilt the pan from side to side to spread the batter out evenly until the pancake is about ⅓ inch thick. Cook until bubbles form and pop on surface of batter and skillet side of pancake is an orange golden brown color (about 3 minutes) then flip and repeat on the other side.
Repeat until all batter is used. Enjoy warm.