Cook the rotini pasta according to package instructions until al dente; drain and cool.
Chop the vegetables: halve the cherry tomatoes, dice the cucumber, and chop the bell pepper and onion.
In a large bowl, combine the cooled pasta with the chopped vegetables.
Add the sliced black olives and crumbled feta cheese to the bowl.
In a separate bowl, whisk together olive oil, red wine vinegar, salt, and pepper.
Pour the dressing over the pasta salad and toss gently to combine.
Adjust seasoning if necessary, adding more salt or pepper to taste.
Garnish with fresh parsley before serving.
Serve immediately or refrigerate for 30 minutes to enhance flavors.
Enjoy your Mediterranean pasta salad as a refreshing side dish or a light meal!