In a large mixing bowl, combine the mixed greens, cherry tomatoes, cucumber, red bell pepper, red onion, kalamata olives, and feta cheese.

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

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

Serve immediately, garnished with additional feta cheese if desired.