Cook gluten-free pasta according to package instructions. Run under cold water. Drain and set aside.
While pasta cooks, get other ingredients ready: shred or dice cooked chicken, dice tomatoes, cucumbers and red onion.
Add cooked pasta, shredded chicken breast, diced tomatoes, cucumbers and red onion to a large mixing bowl.
Whisk together olive oil, lemon juice, Italian seasoning, and Kosher salt.
Pour dressing over salad and toss to combine.
Let sit in fridge for 30 minutes or up to 8 hours before serving.