1. In a large bowl, combine olive oil, lemon juice, garlic, oregano, cumin, paprika, salt, and pepper. Add chicken and toss to coat. Let it marinate for at least 30 minutes, or up to 2 hours for a deeper flavor.
2. Preheat a grill or cast-iron skillet over medium-high heat. Once hot, cook the chicken for about 6-8 minutes on each side or until the internal temperature reaches 165°F. Let it rest for a few minutes before slicing.
3. While the chicken is cooking, prepare your vegetables. The chopping of tomatoes and cucumbers always reminds me of the time I spent in the kitchen with my mom, learning to make the most of what we had.
4. Warm the pita bread in a skillet or directly over an open flame for a few seconds on each side.
5. To assemble, spread a generous amount of tzatziki sauce on the pita, add sliced chicken, and top with tomatoes, cucumbers, and red onion. Sprinkle with fresh dill if desired.
6. Wrap it up and serve immediately, letting the flavors meld together in every bite.

Cooking is about intuition and embracing imperfection. Trust your taste buds and adjust the seasoning as you see fit. Remember, every meal is a chance to learn something new.