For the Cucumber Yogurt Dressing, place cucumber, yogurt, mayonnaise, lemon juice, garlic powder, dill, oregano and sea salt in blender container; cover. Blend on high speed until smooth. Refrigerate until ready to use.
For the Greek Pasta Salad, cook pasta as directed on package, adding broccoli during the last 1 minute of cooking. Rinse under cold water; drain well.
Place cooked pasta, broccoli, tomatoes and onions in large bowl. Add Cucumber Yogurt Dressing; toss gently to coat. Top with olives and feta cheese. Serve immediately or refrigerate until ready to serve.