01 - In a mixing bowl, whisk together olive oil, lemon juice, minced garlic, oregano, paprika, salt, and black pepper. Add chicken breasts and toss to coat evenly. Cover and marinate in the refrigerator for at least 15 minutes.
02 - Rinse rice thoroughly under cold running water. In a saucepan, combine rice, water, and salt. Bring to a boil, then reduce heat to low, cover, and simmer for 15 to 18 minutes for white rice or 35 to 40 minutes for brown rice, until tender. Fluff with a fork and set aside.
03 - Preheat a grill pan or skillet over medium-high heat. Remove chicken from marinade and grill for 6 to 7 minutes per side until cooked through and juices run clear. Rest for 5 minutes, then slice into strips.
04 - While chicken cooks, halve the tomatoes, dice the cucumber, thinly slice the red onion, and halve the olives.
05 - In a small bowl, whisk together tahini, lemon juice, water, minced garlic, olive oil, salt, and black pepper until smooth. Add an extra splash of water as needed to reach a pourable consistency.
06 - Divide cooked rice among four meal prep containers. Layer with baby spinach, tomatoes, cucumber, red onion, Kalamata olives, and grilled chicken strips. Top with crumbled feta cheese.
07 - Drizzle each bowl with lemon tahini dressing and sprinkle with chopped fresh parsley. Seal containers and refrigerate for up to four days.