In a bowl, whisk together olive oil, lemon juice, garlic, oregano, smoked paprika, cumin, salt, pepper, and red pepper flakes until well combined.
Coat the chicken evenly in the marinade. Let it marinate for 15–30 minutes for the best flavor.
Prepare the tzatziki by squeezing excess moisture from the shredded cucumber. Stir it together with Greek yogurt, garlic, lemon zest, olive oil, herbs, salt, and pepper.
Heat a skillet over medium-high heat. Cook the Mediterranean Chicken Bowl chicken for 5–6 minutes per side, or until golden brown and the internal temperature reaches 165°F (74°C).
Rest the chicken for 5 minutes before slicing across the grain.
Divide cooked couscous among serving bowls.
Arrange tomatoes, cucumber, onion, chickpeas, olives, and feta around the couscous.
Top with sliced chicken.
Spoon generous amounts of tzatziki over each bowl.
Garnish with chopped herbs and serve with fresh lemon wedges.