Cook the pasta per the package instructions. Drain and rinse under cold water to shock the pasta and wash off any starch.
While the pasta is cooking chop and prepare the other ingredients.
In a small mixing bowl add the Greek yogurt, mayonnaise, vinegar, Creole mustard and garlic. Mix well with a whisk. Add salt and pepper to taste and mix again. Taste to make sure you’re happy with the seasoning.
In a large bowl add the rinsed pasta, corn, peas, red onion, cherry tomatoes, sweet peppers and tuna.
Drizzle the dressing all over the salad ingredients and mix with salad serving spoons.