Marinate the chicken: In a bowl, whisk lemon zest, lemon juice, olive oil, minced garlic, oregano, cumin, salt, and pepper.
Add chicken and toss to coat. Marinate at least 20–30 minutes (up to 8 hours in the fridge).
Cook your base: Prepare brown rice, quinoa, or farro according to package directions. Fluff and set aside.
For a lower-carb option, sauté cauliflower rice in a little olive oil with salt and pepper until tender.
Prep the veggies: Dice cucumber, halve cherry tomatoes, thinly slice red onion, and chop bell pepper if using. Pit and halve olives. Crumble feta.
Roughly chop parsley or dill.
Make the yogurt sauce: Stir Greek yogurt with olive oil, lemon juice, grated garlic, salt, and pepper. Thin with a splash of water if needed. Taste and adjust lemon or salt.
Optional dressing: Shake olive oil, red wine vinegar, Dijon, honey, oregano, salt, and pepper in a jar until emulsified.
Cook the chicken: Heat a large skillet or grill pan over medium-high.
Add a touch of oil. Cook chicken 4–6 minutes per side (thighs may take longer) until browned and cooked through to 165°F. Rest 5 minutes, then slice or cube.
Assemble bowls: Add a scoop of grains to each bowl.
Top with chicken, cucumber, tomatoes, red onion, olives, and feta. Spoon over yogurt sauce and a drizzle of dressing if using. Finish with chopped herbs and a squeeze of fresh lemon.
Serve: Add pita chips or warm pitas on the side.
For extra heat, toss in pepperoncini or a pinch of red pepper flakes.