Slice the chicken breast into thin, bite-sized strips.
In a small bowl, whisk together the olive oil, cumin, coriander, turmeric, garlic powder, sea salt, and black pepper.
Toss the chicken strips in the spice mixture until evenly coated.
Heat a non-stick skillet over medium-high heat and cook the chicken for 6-8 minutes, stirring occasionally, until golden brown and cooked through.
While the chicken cooks, whisk the Greek yogurt and lemon juice together in a small bowl to create the sauce.
Dice the cucumber and tomato, and thinly slice the red onion.
Warm the pita slightly in a dry pan or microwave, then slice it open or fold it.
Spread the yogurt sauce inside the pita, then stuff with the cooked chicken and fresh vegetables.