For vegan chicken powders, if you are ok with artificial flavorings, the results are a lot stronger. You CAN mimic flavors in a lab, but it's harder to do that in the home kitchen with just garlic, onions, mushrooms, soy sauce, etc.
Harvest Brand: https://amzn.to/2Peotkg (will be quite good, but probably some msg in it)
Massel Brand: https://amzn.to/2XlCmA3
Orington Farm's Chicken Broth: https://amzn.to/2UJhDJG
Spiceworks (UK): https://amzn.to/2XoVAER (very good)
"Shreddable" Vegan Chicken (4-Ingredients!) | Vegan Meat Week - Save The 🌍