In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for about 3-4 minutes until translucent.
Stir in the minced garlic and cook for an additional 1 minute until fragrant.
Add the sliced carrots and celery, cooking for another 5 minutes until they begin to soften.
Incorporate the zucchini, yellow squash, red bell pepper, and green beans. Sauté for about 5 minutes, stirring occasionally.
Pour in the diced tomatoes with their juice and the vegetable broth. Add the dried basil, oregano, salt, and black pepper. Bring the mixture to a boil.
Once boiling, reduce the heat to low and let it simmer for 15-20 minutes until the vegetables are tender.
Stir in the chopped spinach and small pasta, cooking for an additional 10 minutes or until the pasta is al dente.
Taste and adjust seasoning if needed. Serve hot, garnished with grated Parmesan cheese if desired.