Prepare the Dough:

• In a large bowl, combine warm milk, sugar, and yeast. Let it sit for 5-10 minutes until frothy.
• Add melted butter, eggs, and vanilla extract to the mixture. Gradually mix in the flour and salt until a soft dough forms.
• Knead the dough for about 10 minutes until smooth and elastic. Cover with a kitchen towel and let it rise in a warm place for 1-2 hours or until doubled in size.

Make the Chocolate Filling:

• While the dough rises, melt the dark chocolate in the microwave or over a double boiler.
• Stir in the cocoa powder and sugar, mixing until smooth and creamy.

Roll Out the Dough:

• Once the dough has risen, punch it down and roll it out on a floured surface into a rectangle about 18 x 12 inches.
• Spread the chocolate filling evenly across the dough, leaving a small border around the edges.

Shape the Babka:

• Roll the dough tightly from the long edge into a log. Slice the log lengthwise into two halves.
• Twist the two halves around each other, forming a braid-like shape.
• Place the twisted dough into a greased loaf pan and let it rise for 30-60 minutes.

Bake the Babka:

• Preheat your oven to 350°F (175°C).
• Bake the babka for 30-35 minutes or until golden brown and a toothpick comes out clean.

Glaze the Babka:

• After baking, allow the babka to cool for 10 minutes.
• In a small saucepan, combine sugar and water. Heat until sugar dissolves.
• Brush the glaze generously over the top of the warm babka for a glossy finish.