Instructions. Preheat oven to 375 F. Cook lasagna noodles over high heat in a large pot until al dente (just undercooked). Meanwhile, combine the cooked mashed potatoes with cream cheese, green onions, crumbled bacon, garlic powder, salt, pepper and 1/2 cup of the cheddar cheese.. This easy pierogi casserole dinner takes 15 minutes to prepare, and only 35 minutes in the oven! Preheat oven to 350°F and place 20 frozen pierogis in the bottom of a 9x13 inch baking dish. No need to grease the baking dish. Heat oil in a frying pan and add bell pepper, onions and mushrooms. Cook on medium heat until the vegetables are soft.

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Steam 8-10 minutes. Grill - Preheat grill to 400 degrees. Spray both sides of pierogies with olive oil and place on a baking sheet sprayed with cooking spray. Cook 10-12 minutes. Microwave - Place pierogies in a microwave-safe bowl and completely cover with water. Microwave on high power for 6-7 minutes. Drain and serve.. How To Make Pierogi Casserole. Preheat the Oven: Start by setting your oven to 350°F (180°C). Prepare the Baking Dish: Grab a 9×13 inch baking dish and spray it with non-stick cooking spray to prevent sticking. Layer the Ingredients: Begin layering by placing half of the pierogis in the prepared baking dish.