01 -
Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
02 -
In a large skillet over medium heat, heat the olive oil. Add the sliced onions and sauté until softened and golden brown, about 5-7 minutes.
03 -
Add the sliced kielbasa to the skillet and cook for another 4-5 minutes, until lightly browned. Remove from heat.
04 -
In a large bowl, whisk together sour cream, cream cheese, milk, garlic powder, black pepper, and paprika until smooth and combined.
05 -
Place the frozen pierogies in the prepared baking dish. Pour the cream sauce over them and gently toss to coat.
06 -
Add the cooked onions and kielbasa on top of the pierogies and mix slightly to distribute. Sprinkle shredded cheddar cheese evenly over the top.
07 -
Cover the dish with foil and bake for 20 minutes.
08 -
Remove foil and bake for another 10-15 minutes, until the cheese is melted and the dish is bubbly.
09 -
Garnish with chopped parsley before serving.