Marinate the Chicken:

In a bowl, mix olive oil, minced garlic, lemon juice, salt, and pepper. Add the chicken breasts to the bowl and let them marinate for at least 15 minutes.

Preheat the Grill:

Preheat your grill or grill pan over medium-high heat.

Grill the Chicken:

Grill the marinated chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F (75°C). Once done, remove the chicken and let it rest before slicing.

Prepare the Toppings:

While the chicken is resting, slice your choice of fresh vegetables (such as cucumbers, tomatoes, and red onion).

Make the Tzatziki Sauce:

In a small bowl, mix Greek yogurt, minced garlic, lemon juice, and season with salt and pepper. Stir until well combined.

Warm the Pita:

Warm the pita bread on the grill or skillet for about 1 minute per side until soft and slightly toasted.

Assemble the Gyros:

To assemble, place the sliced grilled chicken in the center of each warm pita. Top with fresh veggies and a generous dollop of tzatziki sauce.

Serve:

Serve immediately, or wrap the gyros in foil for easy eating on the go.