Cut the chicken breast into small cubes. Heat the olive oil in a large pot over medium-high heat and brown the chicken until golden.
Finely chop the red onion, garlic, carrot, celery, and tomatoes. Add them to the pot with the chicken.
Season with oregano, smoked paprika, salt, and pepper. Stir well to combine.
Pour in the chicken broth and bring to a simmer. Cook over medium heat for 20 minutes, or until the vegetables are tender.
Add the lemon juice and cook for another 5 minutes to allow the flavors to meld.
When serving, crumble feta cheese over the top of the soup, drizzle with a dollop of tzatziki sauce, and sprinkle with crunchy pita chips.
Serve immediately. Best enjoyed fresh.
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