Bring a large pot of water and 1 tablespoon of olive oil to a boil. Add in the uncooked rotini pasta and boil for about 8-9 minutes. Drain and rinse with cool water.
Combine the cooked rotini pasta with the cucumber, tomatoes, feta cheese crumbles, red onion, black olives, salt & pepper, mixing well. Set aside.
In a small container with lid, combine the red wine vinegar, olive oil, garlic powder and dried oregano. Whisk Shake well.
Poor the dressing over the top of the salad and gently stir to mix. Add more or less to taste.
Place in the fridge to cool if not serving immediately.