Cook pasta of choice in cold salted water until soft according to package directions. Drain well. I don't rinse my pasta, but you can if you like that method.
Add the olive oil to a large skillet over medium-high heat. Season chicken with dried oregano, salt, and pepper. Cook chicken for 5-6 minutes per side, or until cooked through and internal temperature is 165 degrees F. When cooled, shred or chop into bite sized pieces.
Cut red and green bell peppers, cucumbers, red onion, and tomatoes. Add cooled pasta and the cut veggies to a large bowl.
In a small bowl, whisk together red wine vinegar, water, olive oil, garlic powder, dried basil, dried oregano, kosher salt, black pepper, and olive oil. Give it a good stir with a whisk, or put everything in a mason jar and shake well.
Pour dressing over salad and toss well to coat. Top with feta cheese and chopped fresh herbs, if desired.
Notes
I cut my chicken breasts in half and pounded them into equal thickness to speed up the cooking process.Store leftovers in an airtight container in the fridge for up to 3 days. You may need to freshen up the salad with some extra dressing or a splash of oil and vinegar.