A simple side quest that is super easy to complete but with decent rewards. All you need to do is find a Sumpter Beast and watch a race between 2 beasts. The quest itself is easy so you don't really need a guide for it except on the location of where to start it.
How to Start and Complete Chili Con Cloudy Quest in Genshin Impact
Teleport to S7 in Chenyu Vale: Upper Vale and head southeast towards some sort of camp. There will be a quest icon appearing on the map.
Once you accept the quest from Wenhua, follow the quest navigation and head to the Treasure Hoarder's camp. Defeat the enemies and you can see the confrontation between Wenhua and Tusheng.
Go back to Wenhua's camp and witness the competition between 2 Sumpter Beasts before you complete the quest. Yup, that's all.