Prepare the Vegetables: Begin by chopping the cucumber, tomatoes, and bell pepper into bite-sized pieces. Set them aside in a large bowl.
Prepare the Greens: Wash and dry the mixed leafy greens. Add them to the bowl with the vegetables.
Add Protein: If you are using hard-boiled eggs, peel and slice them. Add the eggs to the bowl. Alternatively, add any other protein you may be using, like grilled chicken or chickpeas.
Prepare the Dressing: In a small bowl, whisk together the olive oil, lemon juice, dried oregano, garlic powder, salt, and pepper. Taste and adjust seasoning if needed.
Assemble the Salad: Add the Kalamata olives and crumbled feta cheese to the salad. Pour the dressing over the ingredients and toss gently to combine.
Serve: Garnish with fresh chopped parsley if desired. Serve immediately or store components separately for meal prep.