Begin by boiling water in a large pot.
Add rotini pasta and cook according to package instructions until al dente.
Drain the pasta and rinse it under cold water.
In a large mixing bowl, combine the cooled pasta with cherry tomatoes, cucumber, bell peppers, red onion, and peas.
In a separate bowl, mix mayonnaise, sour cream, Dijon mustard, salt, and pepper to create the dressing.
Pour the dressing over the pasta and vegetable mixture, and toss gently to combine.
Taste and adjust seasoning if necessary.
Cover the salad and refrigerate for at least 30 minutes.
Before serving, give the salad a final toss and garnish with fresh parsley.
Serve chilled and enjoy!