Marinate chicken fillets with 1/2 tsp lime juice, 3 cloves of garlic minced, salt to taste, 1/4th tsp black pepper, A pinch of red chilli (ADD SOME MORE + 1/2 tsp garam masala IF U CANT GET CHICKEN TIKKA MASALA) and marinate for atleast 30 minutes.
Finely slice ur peppers, onions, tomato and cucumber in long thin strips. Take 1 onion and cucumber strips and marinate them in vinegar.
Fry or grill chicken breast fillets with 1-2 tbsp oil. Cook them on medium heat until its little golden from top. Give the fillets good 7-8 mins a side while sprinkling some water 2-3 times just so it doesn't burn but gets cooked juicy and tender. Once done, cool then slice into thin strips.
Take 1/2 -1 tsp oil in separate clean pan, and fry 1 clove of minced garlic for few seconds until aroma comes, add in ur strips of peppers, 1 onion and tomato. Stir fry on hight heat, immediately add 1/2 tsp lime juice, salt, pepper and 1/2 tsp of dried thyme and oregano mixture. Take off the heat.
Mayo garlic dip: It is made with roasted garlic in classic way, but i love my method aswell its convenient too. Just mix together youghurt and mayonnaise in a small bowl, sprinkle some black pepper, add lime juice and 1/2 clove to 1 clove garlic. I gave 1/2-1 of garlic according to ur own liking of garlic strength. Warm ur pita breads and serve it on a platter or roll them as street fashion. Cheese can be put in pockets of bread so that it can melt. Serve chilli garlic sauce as a separate condiment in a small bowl alongwith ur quickly pickled onion and cucumber (it takes u 20 minutes of immersing them in vinegar). Enjoy healthy, clean and juicy shawarma my way.