Marinate the chicken: In a bowl, whisk lemon juice, olive oil, garlic, oregano, cumin, paprika, salt, and pepper. Add chicken and toss to coat.
Marinate 20–30 minutes while you prep the rest.
Make the yogurt sauce: Stir yogurt, lemon juice, olive oil, garlic, dill, salt, and pepper until smooth. Refrigerate to let the flavors blend.
Prep the base: Cook cauliflower rice according to package directions or sauté fresh riced cauliflower in a nonstick pan with a pinch of salt until tender. Let cool slightly.
Dice the veggies: Chop cucumber, halve tomatoes, and slice red onion.
Pat the veggies dry with paper towels to keep the bowls from getting watery.
Cook the chicken: Heat a large nonstick skillet over medium-high. Add the chicken in a single layer and cook 4–6 minutes, flipping once, until lightly browned and cooked through. Don’t overcrowd the pan; cook in batches if needed.
Assemble the bowls: Divide cauliflower rice (or quinoa) among 4 meal prep containers.
Top with chicken, cucumber, tomatoes, red onion, olives, and a sprinkle of feta and parsley.
Add the sauce: Portion the yogurt sauce into small lidded cups or drizzle just before eating. Keeping it separate helps the bowls stay fresh.