In a large pot or Dutch oven, melt the vegan butter over medium heat. Add the onion, carrots, and celery. Sauté until the vegetables have softened.
Add the Impossible meat to the pot and cook until golden brown, breaking the “meat” up with a wooden spoon as you go.
Add the potatoes to the pot and stir in the Dijon, oregano, and parsley.
Stir in the vegetable broth. Turn the heat to medium-high and bring the soup to a boil. Reduce the heat to low, and simmer for 20 minutes or until the potatoes are tender.
In a small bowl, whisk together the cornstarch and water. Pour the cornstarch slurry into the soup and give everything a good stir. Simmer for a few more minutes or until the soup has thickened. If you would like a thicker soup, whisk together an additional tablespoon of cornstarch and an additional tablespoon of water and stir it into the soup.
Stir in the plant milk, nutritional yeast, vegan cream cheese, and vegan cheddar cheese. Continue to simmer, stirring continuously, until the cream cheese and cheddar cheese have melted into the soup.
Taste the soup and season with salt and pepper if desired.
Notes
To store: Transfer cheeseburger soup to an airtight container and keep it refrigerated for up to 4 days. Reheat in the microwave or on the stove over medium heat until warmed through, adding a bit of plant milk if the soup has thickened too much during storage.To freeze: This vegan cheeseburger soup is freezer-friendly; simply place it in a freezer-safe container or heavy-duty freezer bags and store it for up to 3 months. When you're ready to enjoy the soup, thaw it overnight in the refrigerator, then reheat according to the instructions above.