In a bowl, mix Greek yogurt, minced garlic, lemon juice, salt, and pepper.
Add the chicken to the mixture, ensuring each piece is coated. Marinate for at least 2 hours, or overnight in the fridge.
Cook the chicken on a grill or in a pan over medium heat until the internal temperature reaches 165 degrees Fahrenheit.
Warm your bread and add the cooked chicken. Add your preferred toppings such as sliced onions, tomatoes, and tzatziki sauce. Serve warm.
Notes
Marinate your chicken for at least 2 hours, or even better, overnight. This allows the yogurt and spices to fully penetrate the meat, resulting in more flavorful gyros.
Use a meat thermometer to ensure your chicken is cooked thoroughly. The internal temperature should reach 165 degrees Fahrenheit (74 degrees Celsius).
For a smoky flavor, grill the chicken if possible. If not, you can cook it on the stove-top, but you'll miss that charred taste.
Warm up your bread before serving. This can be done on a pan, oven or even directly on the stove flame for a few seconds.
Don't forget to add a good amount of sauce! Gyros are typically enjoyed with tzatziki sauce, a refreshing cucumber yogurt sauce. You can easily make it at home or buy it from the store.