Cheesy Pierogi and Kielbasa Skillet

Directions

1. Heat broiler. In a large skillet over medium-high heat, heat 2 tablespoons of olive oil. Add peppers, onion, and 1/4 teaspoon salt and cook, stirring occasionally, until vegetables are just barely tender, 4 to 6 minutes. Add kielbasa and cook, stirring occasionally, until kielbasa and vegetables are golden in places, 4 to 6 minutes more. Scrape the kielbasa mixture onto a plate.
2. Return the skillet to medium heat and add the remaining olive oil and pierogi. Cook, tossing occasionally until pierogi are golden in places, about 4 minutes. Transfer pierogi to a plate with kielbasa mixture.
3. Increase heat to medium-high. Pour balsamic, and broth into skillet and add cream cheese and mustard. Cook, whisking constantly until broth comes to a boil and cream cheese is melted. Continue to boil, whisking occasionally, until thickened slightly, about 2 minutes.
4. Remove the skillet from heat. Return pierogi, kielbasa, and vegetable mixture to skillet and stir to coat in sauce. Sprinkle with 3/4 cup cheddar and stir a few times to incorporate. Sprinkle top with remaining 1/2 cup cheddar. Broil until cheese is melted, 1 to 2 minutes. Top with scallions. Serve with sour cream alongside.