Wash and chop all vegetables into roughly equal chunks, approximately 1-2 inches in size.
Place all chopped vegetables in a large pot.
Fill the pot 3/4 of the way with cold water, ensuring vegetables are completely covered.
Bring to a boil over high heat, then reduce heat to medium and simmer until vegetables are fork-tender, about 20-25 minutes.
Add salt, pepper, and chicken soup powder to taste, starting with small amounts and adjusting as needed.
Using an immersion blender, blend the soup until smooth and creamy, or leave slightly chunky if preferred.
Taste and adjust seasonings before serving hot.