Sauté aromatics: Heat olive oil in a large pot or Dutch oven over medium heat. When oil shimmers, add in diced onion, sliced carrots, and diced celery. Add a generous pinch of salt and sauté for 5-7 minutes, or until onions are translucent. Add in minced garlic and cook for about 1 minute, until fragrant.
Build the soup: Stir in the plant-based chicken pieces. Pour in 8 cups chicken-style veggie broth. Add in dried thyme, dried parsley, bay leaves, and nutritional yeast. Stir to combine and bring to a gentle boil.
Cook pasta: Add the pasta of choice and cook, stirring occasionally, until just shy of al dente. Remove the pot from the heat. (The pasta will finish cooking with the residual heat.)
Finish and serve: Stir in the juice of half a lemon. Taste and adjust salt, pepper and lemon to preference. Serve right away, optionally garnished with fresh parsley or dill.