Gather all fresh ingredients: lettuce, tomatoes, cucumbers, red onion, bell peppers, and olives.
Rinse all vegetables under cold water to remove dirt.
Chop the lettuce into bite-sized pieces and place in a large salad bowl.
Dice the tomatoes and cucumbers, adding them to the bowl.
Slice the red onion thinly and add to the mix.
Chop the bell peppers into small pieces and add them.
Toss in the olives and crumbled feta cheese.
Prepare the dressing by whisking together olive oil, vinegar, salt, and pepper.
Pour the dressing over the salad and toss gently to combine.
Garnish with fresh basil leaves before serving.