Greek Chicken Salad with Tzatziki

In a bowl, mix the chicken breast fillet with olive oil, oregano, salt and pepper. Leave to marinate for at least 30 minutes. Heat a pan and cook the marinated chicken over medium heat for 6-7 minutes per side, until cooked through and golden brown. Then remove from heat and cut into strips. In a large bowl, combine the shredded lettuce, diced cucumber, diced tomatoes, sliced ​​red onion and black olives. Sprinkle the crumbled feta cheese over the salad. In a bowl, mix the Greek yogurt, grated cucumber, crushed garlic, olive oil, fresh dill and salt together well. Arrange the chicken strips on the salad and serve with the tzatziki.