In a large bowl, add the lukewarm milk and yeast, stirring gently to mix. Set aside until bubbly, about five minutes.
Add the flour, salt, butter, vanilla, and eggs, and mix to combine. {I used a hand mixer}
Cover and set aside until doubled, about 30 minutes.
While dough is rising, cut dark chocolate squares into 3 strips. Set aside.
Heat a Belgian waffle maker, and when ready, add a 3 to 4 ounce scoop of dough to each cavity.
Cook until browned, and very carefully remove from your waffle maker.
Place on a wire cooling rack, and continue cooking additional waffles.
While waffles are still hot, gently push 2 strips of chocolate into the center of each waffle.
If all of your chocolate squares break apart while cutting, place them in a small bowl and melt them in the microwave. Drizzle the melted chocolate over the waffles.