Step 1

Bring a large pot of salted water to a boil. Cook penne according to package directions.

Step 2

Meanwhile, heat butter and oil in a skillet over medium-high heat. Cook onions for 10-15 minutes, stirring often. Once they’ve become caramelized, add the mushrooms and cook another 4-5 minutes. Season with salt and pepper to taste. Remove from the pan, and set aside.

Step 3

In the same pan, add the chicken thighs. (If needed, add another drizzle of oil.) Cook for 7-10 minutes, or until golden brown on both sides and cooked through. Remove from pan and set aside.

Step 4

Return onion and mushroom mixture to the skillet. Add heavy cream, and stir well, scraping all the bits from the bottom the pan. Simmer on medium-low for 2-3 minutes, or until cream has reduced slightly. Taste for seasoning, and adjust as needed. Slice the chicken into large pieces.

Step 5

Add the cooked, drained pasta to the sauce, along with the sliced chicken and parsley. Toss well, and serve with freshly grated Parmesan cheese.