Marinate the chicken. In a bowl, combine olive oil, lemon juice, oregano, garlic, paprika, salt, and pepper. Add chicken and toss to coat.
Let it sit at least 20 minutes, or up to 8 hours in the fridge.
Cook the chicken. Heat a large skillet or grill pan over medium-high. Add the chicken and cook 5–7 minutes per side, until the internal temp reaches 165°F. Rest 5 minutes, then slice or cube.
Mix the dressing. Whisk olive oil, lemon juice, Dijon, honey, oregano, garlic, salt, and pepper until emulsified.
Taste and adjust salt or lemon as needed.
Prep the veggies. Chop cucumber, tomatoes, bell pepper, and onion. Halve olives. Crumble feta.
Chop herbs. Keep greens dry—pat if needed.
Assemble for meal prep. Use 4–5 airtight containers. For best texture, layer in this order: Bottom: sturdy veggies (cucumber, pepper, onion, olives)
Middle: tomatoes, chicken
Top: feta and herbs
Sides: greens in a separate bag or container
Dressing: portion into small lidded cups
Serve. When ready to eat, add greens to the bowl, pour on dressing, and toss.
If adding grains or avocado, do it just before serving.