Cook pasta according to package directions.

Dice the tomato and mix with the feta in a large bowl, set aside.

In a small bowl make the dressing by whisking together the olive oil, vinegar, lemon juice, garlic, mustard, onion powder, and salt.

Once pasta is done drain and rinse with cool water. After the pasta cools for a few minutes add it to the large bowl with the tomato and feta.

Dice the avocados and add to the bowl with the pasta as well. Pour the dressing over top and toss to combine. Garnish with extra feta if desired and serve at room temperature or chilled. Avocados may brown if stored overnight.