While the chicken is marinating you can prep the rest of your ingredients (cook the fries; chop tomatoes and onions; thinly slice lettuce).
When the fries are done cooking, toss with a drizzle of olive oil and big pinches of garlic powder, salt, pepper and dried oregano. Set aside.
Cook the chicken according to chicken skewer recipe.
When all ingredients are prepped, assemble the gyros. Use the pitas fresh to toast briefly in a pan with a bit of butter or olive oil. Then fill the pitas with: tzatziki, fries, chicken, lettuce, onions, tomatoes and feta cheese. Wrap the pita up by folding in half and enjoy!