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Stir together all of the tzatziki ingredients and refrigerate while you prepare the tacos.
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In a bowl, combine the ground chicken with the oregano, garlic powder, onion powder, smoked paprika, cumin, salt, pepper, and parsley.
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Divide into 8 equal portions (about 2 oz / 57 g each).
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Press each portion into a thin, even layer over one side of each tortilla.
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Heat a cast-iron skillet over medium-high heat and lightly spray with avocado oil.
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Place the tacos chicken-side down and cook for about 3–4 minutes until nicely browned.
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Flip and cook another 1–2 minutes until the chicken reaches 165°F (74°C) and the tortilla becomes lightly crisp.
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Top with cucumber, tomatoes, red onion, feta, plenty of tzatziki, fresh parsley, and a squeeze of lemon.
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Storage: Store leftover smashed tacos in an airtight container in the refrigerator for up to 3 days. For the best texture, store the chicken, toppings, and tzatziki separately, then reheat the tacos in a skillet or air fryer until crispy before adding the fresh toppings and sauce. Freezing is not recommended once assembled.