Preheat waffle iron according to manufacturer's directions.

In a large bowl, whisk together the flour, oats, baking powder, cinnamon and salt. Mix in the chocolate chips and walnuts if desired.

In a medium sized bowl, whisk together the eggs, milk, oil, brown sugar, and vanilla.

Now add the wet mixture into the bowl with the dry mixture. Stir both together until just combined. Do not over mix.

Add the amount of batter needed to the waffle maker according to the manufacturer's instructions and cook accordingly. The number of waffles made will vary by your waffle maker, but should range between 4 and 8. I got 4 Belgian sized waffles.