Combine flour, cocoa powder, yeast, and salt in a bowl.
Add lukewarm water and sugar, then knead the dough.
Knead the dough for 10 minutes and shape it into a ball.
Let the dough rise for 1 hour.
Divide the dough into individual portions and shape them into bagels.
Boil the bagels in hot water for 1 minute on each side.
Bake in a preheated oven at 180°C for 20 minutes.