Creating delicious chocolate cinnamon rolls can be a fun and rewarding process. Follow these steps to ensure perfect results:

1. Activate Yeast: In a small bowl, combine warm milk (110°F or 43°C) and granulated sugar. Sprinkle the yeast over the top and let it sit for 5-10 minutes until frothy.
2. Mix Dry Ingredients: In a large mixing bowl, whisk together the flour and salt.
3. Combine Wet Ingredients: In a separate bowl, whisk together the melted butter, eggs, and vanilla extract.
4. Combine Mixtures: Add the yeast mixture and wet ingredients to the dry ingredients. Stir 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 doubled in size.
7. Prepare Filling: In a small bowl, mix together the brown sugar and cinnamon.
8. Roll Out Dough: Once the dough has risen, punch it down and turn it out onto a floured surface. Roll it into a rectangle about ¼ inch thick.
9. Add Filling: Spread melted butter over the rolled-out dough, then sprinkle the cinnamon-sugar mixture evenly across the surface. Finally, sprinkle the chocolate chips on top.
10. Roll Up: Starting from one edge, carefully roll the dough tightly into a log shape.
11. Slice Rolls: Cut the log into 12 equal pieces and place them in a greased baking dish.
12. Second Rise: Cover the rolls with a towel and let them rise for another 30 minutes.
13. Preheat Oven: While the rolls are rising, preheat your oven to 350°F (175°C).
14. Bake Rolls: Bake the rolls in the preheated oven for 25-30 minutes or until golden brown.
15. Cool: Remove from the oven and let them cool in the pan for about 10 minutes.