Finely chop the dark chocolate so it melts evenly into the batter while baking.
In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, and a pinch of salt.
In another bowl, whisk the eggs, then add the milk, melted butter, and vanilla extract.
Pour the wet ingredients into the dry ingredients and whisk until just combined. Be careful not to overmix; a few lumps are okay.
Gently fold in the chopped dark chocolate.
Preheat your waffle iron to medium heat and lightly grease it with butter or oil.
Pour a portion of the batter onto the center of the waffle iron (about 1/2 cup), 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, ensuring it remains crispy.
Serve fresh, drizzled with dark chocolate sauce, and sprinkle with extra dark chocolate chunks.
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