Place the yeast, 10 g sugar and 75 ml lukewarm milk in the bowl of your stand mixer.
Stir with a spoon and let it stand for 5 to 10 min or until the mixture starts to foam.
Then add the remaining sugar and milk, and the flour, cacao, cinnamon, cardamom, salt, vanilla essence (extract), butter and egg.
Knead the dough with your stand mixer or by hand for at least 5 minutes. Then add the chocolate chips and knead for another 2 to 3 minutes until the dough feels smooth and elastic.
Place the dough in a lightly oiled bowl and cover tightly with a plastic wrap.
Leave it to rise in a warm, draught-free spot for an hour or until doubled in size.
Put the dough onto your flour-dusted work surface and form the dough into a log. This will deflate the dough but you don't have to worry about it.
Cut the dough into 12 equal pieces and roll each into a smooth ball.
You can either grease your baking tin or line it with non-stick parchment paper.
Put all the balls into the prepared cake tin (3x4) and cover the tin with a lightly oiled plastic wrap.
Let the dough rise for another 30 to 40 minutes.
While the dough is rising preheat your oven to 180 degrees C.
If you want to make the crosses, mix the flour and water, fill the mixture into a small plastic bag, cut one edge off and pipe the crosses over each bun.
Bake the buns for 25 minutes in your preheated oven.
Once the buns are baked, mix the apricot jam and water in a small jar.
Heat it in the microwave and brush the warm mixture over your buns.
If you don't want to make the crosses, you can decorate your buns with chocolate eggs or other Easter treats.
The buns are best eaten warm. You can keep them in the fridge for 2 days or freeze any leftovers.