To start, bloom your yeast. Mix your active dry yeast, sugar, and warm milk together. Let it sit for 10 minutes until foamy on top.
1 1/4 cups (300 ml) whole milk, warmed to about 110 degrees, 2 1/4 tsp active dry yeast, 1 tsp granulated white sugar (to bloom the yeast)
Next, in a large bowl of a stand mixer with a whisk attachment, mix flour, black cocoa powder, salt and sugar together.
4 1/2 cups (562 g) all-purpose flour, spooned and leveled, 3/4 cup (60 g) black cocoa powder, 1 1/2 tsp salt, 2 tbsp (25 g) granulated white sugar
To the dry ingredients add the whisked eggs, vanilla, and softened butter and mix.
2 eggs, whisked , 1 tbsp vanilla, 1/2 cup (112 g) unsalted butter, very softened
Add in the yeast and milk mixture and mix until everything is blended. At this point, add in some black food coloring if you want the dough to be super black! Switch to a dough hook attachment and knead on medium speed for 7-10 minutes until the dough pulls away from the sides of the bowl, forms a ball and springs back when pressed.
black gel food coloring, optional
Form the dough into a ball. Place the dough in a large, greased bowl. Cover with plastic wrap or a kitchen towel and place in a warm place to rise, (outside or a cold oven with the light on works well for this), for 1- 1 ½ hours, or until the dough doubles in size.