Right-clicking mushroom stew will allow you to gain health and food, determined by a permission, skipping the eating animation.
If you want a simple way to do this, then this plugin is for you!
fastsoup.hearts.<value> - Makes soup add <value> health values to the player. Each health value is half a heart.
fastsoup.food.<value> - Makes soup add <value> food levels to the player. Each level is half a nugget.
