In a small bowl, whisk together olive oil, vinegar, garlic, oregano, mustard, salt, and pepper.
On a large serving platter, arrange lettuce, cucumber, green pepper, tomatoes, feta, red onion, and olives. Garnish with mint. Serve with dressing.
Tiffy's Tips~Serve with grilled chicken, shrimp, or salmon for added protein.~I like using an emulsifier when making salad dressings for the perfect consistency.~Store dressing in an airtight container for up to two weeks.~Goat cheese is a great substitute for the feta cheese.