In a large bowl whisk the flour, oats, baking powder, salt and cinnamon together. Set aside.
In another bowl whick together the mashed bananas, vanilla, buttermilk, and egg.
Pour the wet ingredients in the dry ingredients and stir to combine, just until combined, but do not overmix.
Stir in pecans.
Heat the waffle iron according to manufacturers directions. Spray with nonstick cooking spray when the waffle iron is ready. Drop batter onto iron, close lid and cook until waffles are golden brown.
Serve warm with butter and maple syrup.
Notes
For an extra-special treat sprinkle top of cooked waffles with powdered sugar and ground cinnamon.