This mod will allow you to replace your chickens with chunky chonkins. So, the chickens will be a lot fatter than they already were.
You can choose between the two versions: the first with the wattle (pinky face skin) and the other without.

How to install this mod?

First, you need to download the CHONKINS.xnb file from the provided link. You can find this file in the main sets or in the premium sets.

Next, you need to extract this file and put it where your old ones were. You need to make sure that the new.xnb files are in the same folder as the old ones.

Finally, you need to launch the game and enjoy the rotund floofs.