In a jar or dressing container combine red wine vinegar, garlic power, basil, oregano, salt and Dijon mustard. While whisking slowly stir in olive oil. Continue to stir until fully combined or close lid and shake.
Store leftover dressing in the fridge to use later.
Chop romaine hearts. Place in a large serving dish. Top with tomatoes, cucumber slices, red onions slices. Sprinkle with Feta cheese. Serve with dressing.