Cook the pasta according to package instructions until al dente. Drain and rinse under cold water to cool.

In a large mixing bowl, combine the cooked pasta, tuna, cherry tomatoes, cucumber, red onion, black olives, and peas.

In a small bowl, whisk together mayonnaise, Greek yogurt, lemon juice, dijon mustard, salt, and pepper until smooth.

Pour the dressing over the pasta mixture and toss until everything is well coated. Garnish with fresh parsley and serve chilled.