Finely chop or coarsely grind the walnuts and set aside.
In a large mixing bowl, combine the flour, sugar, baking powder, ground walnuts, and a pinch of salt.
In a separate bowl, whisk the eggs, then add the milk, melted butter, and vanilla extract.
Pour the wet ingredients into the dry ingredients, and whisk until you have a smooth, lump-free batter.
Preheat your waffle iron to medium heat and lightly grease it with butter or oil.
Pour a portion of the batter into the center of the waffle iron (about one ladleful), close the lid, and cook until golden brown, about 3-4 minutes.
Once ready, carefully remove the waffle with a spatula and place it on a wire rack to cool, ensuring it remains crispy on the outside.
Serve fresh, drizzled with maple syrup, and sprinkle with extra walnuts on top.
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