Cook spaghetti according to package directions, seasoning the boiling water with one tablespoon of kosher salt. Stir noodles often while cooking. Drain well after cooking until al dente.

In a large bowl, add all diced veggies, olives, and cheeses.

Add the cooked and cooled spaghetti on top. Season salad with McCormick Salad Supreme seasoning and garlic powder. Give it all a gentle toss.

Pour Italian dressing over noodles and stir mixture carefully until combined.

Cover with plastic wrap and allow to cool for at least two hours before serving.