Cut cherry tomatoes and cucumbers into bite-sized pieces.
Thinly slice the onion.
Remove the seeds from the bell pepper and slice it.
Prepare black olives and feta cheese.
Place all the vegetables, olives, and cheese in a bowl.
Make a dressing with olive oil, lemon juice, salt, and pepper, then drizzle it over the salad.
Lightly toss and serve on a plate.