Creating Savory Pierogi Casserole with Kielbasa can be simple when you follow these steps:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C). Grease a 9×13-inch baking dish with cooking spray or butter.
2. Cook Kielbasa: In a skillet over medium heat, cook the sliced kielbasa until browned. Remove and set aside.
3. Sauté Onions: In the same skillet, add the diced onion. Sauté until translucent, about 4-5 minutes.
4. Layer Ingredients: In the prepared baking dish, place half of the frozen pierogi at the bottom. Top with half of the cooked kielbasa, half of the sautéed onions, and half of the cheddar cheese.
5. Add Sauce: In a bowl, mix together the sour cream, chicken broth, garlic powder, smoked paprika, dried parsley, salt, and pepper. Pour half of this mixture over the first layer in the dish.
6. Repeat Layers: Add the remaining pierogi, kielbasa, onions, and cheddar cheese. Pour the rest of the sauce evenly on top.
7. Cover and Bake: Cover the baking dish with aluminum foil and bake for 25 minutes.
8. Uncover and Finish Baking: Remove the foil and bake for an additional 15 minutes, until the cheese is bubbly and golden.
9. Rest: Remove from the oven and let it sit for 5-10 minutes before serving to allow the layers to set.
10. Serve: Garnish with freshly chopped parsley or chives for an added burst of flavor and color.

These instructions ensure that your casserole is not only easy to assemble but also incredibly tasty!