In a large mixing bowl, combine mixed greens, cherry tomatoes, cucumber, feta cheese, red onion, and black olives.

In a separate bowl, whisk together olive oil, red wine vinegar, dijon mustard, minced garlic, salt, and black pepper to make the dressing.

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

Serve immediately or refrigerate for up to 30 minutes before serving.