add all ingredients to slow cooker, other than pasta, and stir to combine
3 carrots, 3 celery stalks, 2 green onions, 2 zucchini, 1 cup peas, 1 cup corn kernels, 14.5 oz diced tomatoes, 6 oz tomato paste, 1 tbsp soy sauce, 1 tbsp Italian seasoning, 2 tsp garlic powder, 8 cups vegetable broth