Boil a large pot of salted water over high heat. Once boiling, add the spaghetti and cook for 8–10 minutes until al dente. Stir occasionally.

Drain the spaghetti and rinse it under cold water until completely cool to halt the cooking process.

While the spaghetti cooks, wash and prepare your vegetables: halve the cherry tomatoes, dice the cucumber, and finely chop the green and red bell peppers.

In a large mixing bowl, combine the cooled spaghetti and all prepared vegetables. Fold gently with a spatula or tongs.

Pour the Italian dressing over the salad and toss gently to coat everything evenly.

Season with salt and freshly ground pepper to taste, and mix in grated Parmesan cheese if desired.

Cover and refrigerate for at least 1 hour to allow flavors to meld or serve immediately if preferred.

Before serving, give the salad a quick toss, check the seasoning, and present in a lovely bowl.