Heat a large dutch oven (soup pot) to medium heat.
Wash and finely dice white onion, carrots, jalapeño, and celery. Slice zucchini into half moons.
Add the butter into the hot pot and then add white onion, celery, carrots, and jalapeños.
Sauté for 5-8 minutes, then add the sweet corn and diced zucchini.
Allow vegetables to sauté for 12-15 more minutes. Sprinkle dried thyme and sage into the pot. Continue stirring to avoid burning.
Pour in the vegetable broth and milk and allow the soup to simmer for 15 minutes.
Carefully use a glass measuring cup and transfer half of the soup into a blender. Pulse on high for 30-45 seconds until ingredients are blended (you could also use an immersion blender).
Pour the blended soup back into the dutch oven and stir. Add in COOKED rice and stir again.
Serve with fresh grilled garlic or cheese bread, crackers, croutons, dumplings, shaved parmesan, etc.