01 - Whisk together olive oil, lemon zest and juice, minced garlic, oregano, thyme, salt, and pepper in a bowl. Add chicken breasts and coat thoroughly. Cover and refrigerate for at least 15 minutes, up to 4 hours for maximum flavor infusion.
02 - Set oven to 425°F to prepare for baking the assembled flatbreads.
03 - Heat grill pan or skillet over medium-high heat. Sear marinated chicken for 5–6 minutes per side until golden brown and internal temperature reaches 165°F. Rest for 5 minutes before slicing into thin strips.
04 - Combine Greek yogurt with chopped fresh dill in a small bowl. Mix until evenly incorporated and set aside for assembly.
05 - Arrange flatbreads on baking sheet. Spread dill yogurt evenly across surface. Distribute sliced chicken, cherry tomatoes, red onion, Kalamata olives, and crumbled feta over each flatbread.
06 - Bake for 8–10 minutes until edges are crisp and toppings are heated through.
07 - Remove from oven. Top with fresh baby arugula, drizzle with extra virgin olive oil, and season with freshly ground black pepper. Slice into portions and serve immediately.