Cook the pasta: Bring a pot of salted water to a boil and cook the pasta according to the package instructions until al dente. Drain and set aside to cool.

Chop the veggies: Dice the tomatoes and cucumbers, then thinly slice the red onion.

Combine ingredients: In a large bowl, toss together the cooled pasta, veggies, Kalamata olives, feta cheese, and herbs.

Prepare the dressing: Whisk together olive oil, red wine vinegar, Dijon mustard, minced garlic, salt, and pepper in a separate bowl.

Dress the salad: Pour the dressing over the salad mixture and toss to coat. Let it sit for a few minutes to meld flavors.