Mix the marinade. In a large bowl, whisk yogurt, olive oil, lemon juice, garlic, and all spices until smooth.
Taste for salt and heat. It should be bold and slightly tangy.
Prepare the chicken. Trim extra fat. Slice large thighs or breasts into 1-inch thick strips for quick, even cooking.
Marinate. Add chicken to the bowl and toss to coat.
Cover and refrigerate at least 30 minutes, ideally 2–12 hours. Longer marinating means deeper flavor.
Cook your grain. While the chicken marinates, cook rice or quinoa according to package instructions. Fluff and season with a pinch of salt and a drizzle of olive oil.
Prep the veggies. Dice the cucumber and tomatoes, slice the red onion thin, and chop the lettuce.
Pat the veggies dry with a paper towel so they stay crisp in storage.
Make the sauce. Stir together Greek yogurt, tahini, lemon juice, garlic, water, and salt. The texture should be pourable but not runny. Adjust lemon and salt to taste.
Cook the chicken. Heat 1 tablespoon olive oil in a large skillet over medium-high.
Add chicken in a single layer. Cook 4–6 minutes per side until browned and cooked through (165°F/74°C). Work in batches to avoid steaming.
Rest and slice. Let the chicken rest for 5 minutes.
Slice into bite-size pieces for easy eating.
Assemble bowls. Divide rice among 4–5 meal prep containers. Top with chicken, cucumber, tomato, red onion, and lettuce. Add a spoonful of pickled onions or turnips if using.
Finish with sauce and herbs. Drizzle each bowl with the yogurt-tahini sauce or pack it in a small container to add right before eating.
Sprinkle with parsley and add lemon wedges.