Boil the chickpea pasta in salted water according to package directions until al dente, then drain and rinse with cold water to stop the cooking.
Season the chicken breast with half of the sea salt, black pepper, and dried oregano.
Grill or pan-sear the chicken over medium-high heat for 5-6 minutes per side until fully cooked, then let it rest before slicing into bite-sized strips.
In a large mixing bowl, whisk together the extra virgin olive oil, balsamic vinegar, and the remaining oregano, salt, and pepper to create the dressing.
Add the cooled pasta, sliced chicken, chopped sun-dried tomatoes, baby spinach, diced cucumber, and minced red onion to the bowl.
Toss all ingredients thoroughly until the dressing is evenly distributed and the spinach is slightly wilted from the contact.
Serve immediately or refrigerate for 30 minutes to allow the flavors to meld.