In a small bowl, whisk together the olive oil, lemon juice, Dijon mustard, oregano, garlic, salt and pepper.
Divide the dressing evenly between four medium-to-large mason jars.
Add the cucumber first, followed by the cherry tomatoes, chickpeas and red onion.
Add the crumbled feta, then fill the remaining space with chopped romaine.
Seal the jars and refrigerate upright until you're ready to eat.
When ready to enjoy, shake the jar well to distribute the dressing, then pour everything into a bowl or eat straight from the jar.
Add more protein: Make it your own by adding grilled chicken, tuna, salmon or extra chickpeas for an additional protein boost.
Layer it: Keep the dressing and sturdy vegetables at the bottom and the romaine at the very top. This keeps the lettuce away from the dressing so it stays crisp until you're ready to eat.
