Sauté aromatics: In a pot, heat olive oil over medium heat until shimmering. Add diced onion, celery, carrot and garlic and sauté 3-5 minutes, or until the onions are translucent.
Add broth & chick'n: Pour in the vegetable broth, then add in the bay leaves and chopped vegan chicken. Bring the broth up to a boil.
Cook the rice (or pasta): Stir in the rice (or orzo). Reduce the heat to medium-low if needed to maintain a gentle boil. Cook for 12-15 minutes, or until the rice is tender. (If you're using orzo, it may cook a bit faster; cook until it's approaching al dente.) Stir occasionally to keep the rice/pasta from sticking to the bottom.
Make the lemon sauce: In the meantime, add lemon juice and silken tofu to a blender. (You can also use an immersion blender; just add the ingredients to a jar or measuring cup with high sides.) Blend until the mixture is perfectly smooth.
Thicken the soup: Stir the tofu-lemon mixture into the soup. It may start out a little foamy; just keep gently stirring it and it will gradually become smooth. Let the soup simmer for another minute or two to heat everything through.
Taste and adjust: Add salt and pepper to preference. (If you used regular vegetable broth, you will likely need to add extra salt. If you used a chicken-style bouillon, these tend to run quite salty, so you may need little to no extra salt.)
Serve: Garnish the soup with plenty of chopped fresh parsley or dill. Enjoy!