Finely chop the dark chocolate to ensure it melts evenly into the batter during baking.
In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, ground chili, 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 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 with butter or oil.
Pour a portion of the batter onto the center of the waffle iron (about one ladleful), close the lid, and cook until golden brown, approximately 3-4 minutes.
Once cooked, carefully remove the waffle with a spatula and place it on a wire rack to cool slightly, which helps maintain its crispness.
Serve fresh, drizzled with dark chocolate sauce and sprinkled with a little extra chili or chocolate chips.
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