Marinate the chicken: In a bowl, whisk olive oil, lemon zest and juice, garlic, oregano, cumin, salt, and pepper. Add the chicken and toss to coat.
Marinate at least 30 minutes, or up to 8 hours in the fridge. Longer time means more flavor.
Cook your grain: While the chicken marinates, cook quinoa, farro, or brown rice per package directions. Fluff with a fork and set aside.
A small drizzle of olive oil and a pinch of salt help the grains taste their best.
Make the sauce: Stir yogurt, olive oil, lemon juice, dill, and grated garlic together. Season with salt and pepper. Thin with a splash of water or milk until spoonable but not runny.
Chill until ready to use.
Prep veggies: Dice cucumber and bell pepper, halve tomatoes, and slice red onion. If the onion is sharp, soak slices in cold water for 10 minutes and drain.
Cook the chicken: Heat a large skillet or grill pan over medium-high. Add a little oil if needed.
Cook chicken 5–7 minutes per side, depending on thickness, until browned and the internal temp reaches 165°F (74°C). Rest 5 minutes, then slice.
Assemble the bowls: Divide grains into bowls. Top with sliced chicken, cucumber, tomatoes, onion, bell pepper, olives, feta, and parsley.
Finish with sauce: Spoon the yogurt-dill sauce over the top.
Add optional extras like hummus or roasted chickpeas if you want even more protein and texture.
Taste and adjust: Add a squeeze of lemon, a pinch of salt, or a drizzle of olive oil to brighten everything up.