In a bowl, mix all the ingredients for the Shawarma spices (cumin, paprika, coriander, turmeric, cardamom, cayenne pepper, salt, and black pepper).
Mix the spice blend with yogurt, lemon juice, and minced garlic.
Mix the chicken slices with the marinade, massage thoroughly, cover, and refrigerate for at least 4 hours, ideally overnight.
Preheat the oven to 200 °C (390 °F).
Spread the marinated chicken in a single layer on a baking sheet lined with parchment paper. Bake for 25-30 minutes until the meat is cooked through and the edges are crispy.
For extra crispiness, you can switch to the broiler briefly.
Remove the cooked meat and slice it into smaller, thin strips, similar to those from a vertical rotisserie.
Warm the pita bread. Spread it with a generous spoon of Toum sauce or Labneh. Add pickles, French fries, and a pile of the sliced meat.
Add fresh garnish (tomatoes, onion with parsley) and roll tightly. Serve immediately.