Cook pasta according to directions on the box (about 11 minutes). Make sure to add 2 tsp of salt to the water. Strain and set aside.
While the pasta is cooking dice onion, and cucumber. Half the cherry tomatoes and slice the olives (if needed.) Set aside.
Pour pasta into a serving bowl. Let Cool. If the pasta is slightly warm it's ok. You will refrigerate after you get it all together.
Mix the veggies and olives into the pasta.
Pour the dressing over the pasta and mix well.
Fold the feta cheese into the pasta.
Taste and add more salt and pepper as needed.
If you are making this the day before check out the tips in the post.
Refrigerate until you are ready to serve.