Penne with Caramelized Onions, Peppers and Feta Recipe

2 tablespoons olive oil
1 small onion, slivered
2 large red bell peppers, slivered
¼ teaspoon kosher salt
Coarsely ground black pepper
1 (16-ounce) box short pasta, (such as penne, rigatoni, bowties)
1 cup (4 ounces) crumbled feta cheese

1. Heat olive oil in a large skillet over medium-high heat. Add onion, bell peppers, salt and pepper. Sauté 20 to 30 minutes. Meanwhile, boil pasta according to package directions and drain. Remove 2 cups plain pasta and toss with butter for the kids. Place remaining pasta in skillet with pepper mixture. Toss well. Scatter with feta cheese, cover and cook over low heat 5 to 10 minutes. Serves 4.