In a small saucepan, melt the butter over low heat, then let it cool slightly so it's not too hot for the batter.
In a large mixing bowl, whisk together the whole wheat flour, oat flour, baking powder, cinnamon, and salt.
In another bowl, whisk the eggs, then add the milk, vanilla extract, and honey.
Pour the wet ingredients into the dry ingredients and whisk until just combined. Avoid overmixing; a few lumps are okay.
Gradually whisk in the melted butter to create a smoother batter.
Preheat your waffle iron to medium heat and lightly grease it with oil or butter.
Pour a portion of batter onto the center of the waffle iron (about 1/2 cup or according to your waffle iron's instructions), close the lid, and cook until golden brown, about 3-4 minutes.
Once cooked, carefully remove the waffle with a spatula and place it on a wire rack to cool slightly and maintain its crispness.
Serve fresh with your favorite toppings, such as fresh fruit, honey, or plain yogurt.
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