Creating these Chocolate Cinnamon Rolls is easy if you follow these simple steps:

1. Activate Yeast: In a small bowl, combine warm milk (about 110°F) and sugar. Sprinkle yeast over the top and let it sit for about 5-10 minutes until frothy.
2. Mix Dry Ingredients: In a large mixing bowl, whisk together flour, salt, cocoa powder, and ground cinnamon.
3. Combine Wet Ingredients: In another bowl, mix melted butter, eggs, and vanilla extract. Add the activated yeast mixture and stir until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until a soft dough forms.
5. Knead Dough: Turn the dough onto a floured surface and knead for about 5-7 minutes until smooth and elastic.
6. First Rise: Place the dough in a greased bowl, cover with a clean kitchen towel, and let it rise in a warm place for about 1 hour, or until it has doubled in size.
7. Prepare Filling: In a small bowl, mix together brown sugar and cinnamon.
8. Roll Out Dough: After the dough has risen, punch it down and roll it out on a floured surface into a rectangle (approximately 16×12 inches).
9. Spread Butter: Spread softened butter evenly over the dough, leaving a small border around the edges.
10. Add Filling: Sprinkle the cinnamon-sugar mixture evenly over the buttered dough, followed by the chocolate chips.
11. Roll Up: Starting from the long edge, tightly roll the dough into a log. Pinch the seam to seal.
12. Cut Rolls: Slice the log into 12 equal pieces and place them in a greased baking dish, cut side up.
13. Second Rise: Cover the rolls with a towel and let them rise for another 30-45 minutes, or until they have puffed up.
14. Preheat Oven: Preheat your oven to 350°F (175°C).
15. Bake: Bake the rolls for 25-30 minutes until golden brown and cooked through.
16. Cool: Remove from the oven and let the rolls cool in the pan for about 10 minutes.
17. Dust with Powdered Sugar: If desired, sprinkle powdered sugar over the rolls before serving.

These steps will guide you in creating incredible Chocolate Cinnamon Rolls that are sure to impress!