Bring a large pot of salted water to a boil and cook pasta according to package instructions for al dente pasta. Drain and drizzle with a little olive oil to prevent the pasta from sticking together.

In a large skillet over medium-high heat, add the olive oil. When the oil is hot, add the onion. Saute for 2 minutes, until softened. Add the garlic and continue cooking for an additional 30 seconds.

Add the peppers and cook, stirring frequently for 3 minutes, until crisp-tender. Stir in olives, oregano, salt, and pepper.

Add the cooked pasta and reserved cooking water, stirring gently to coat the pasta. Remove from heat.

Gently stir the feta cheese into the cooled pasta.

Adjust seasoning to taste, transfer to a large bowl, and serve.