In a large mixing bowl, combine the chopped romaine lettuce, cherry tomatoes, cucumber, bell pepper, red onion, feta cheese, and black olives.

In a small bowl, whisk together the olive oil, red wine vinegar, Dijon mustard, minced garlic, salt, and black pepper until well combined.

Drizzle the dressing over the salad and toss gently to combine. Serve immediately.