Heat olive oil in a large pot over medium heat. Add onion, carrots, and celery, and sauté until they start to soften, about 5 minutes.
Add minced garlic and sauté for another minute until fragrant. Pour in vegetable broth and bring to a simmer.
Add cubed potatoes to the pot. Cover and simmer for about 10 minutes.
Stir in frozen green beans, corn, and peas along with dried thyme. Continue to simmer until all vegetables are tender, about 15 minutes. Season with salt and pepper to taste and serve.