Step 1

Preheat oven to 375 degrees F. Coat an 8- x 8-inch baking dish or 2-quart casserole dish with cooking spray.

Step 2

In a saucepan over medium heat, melt butter and sauté onion and garlic for 7 to 9 minutes or until onions start to turn golden, stirring occasionally. Stir in flour and cook for 1 minute. Gradually add milk, salt, and pepper, and cook until mixture begins to thicken, stirring constantly. Add cheese and continue stirring until melted.

Step 3

Pour 1/2 cup of cheese sauce in bottom of baking dish. Place a layer of pierogi on top. Pour half of the remaining cheese sauce over pierogi. Repeat layers with pierogi and cheese sauce. Sprinkle with paprika.

Step 4

Cover and bake for 30 minutes. Uncover and bake for an additional 15 to 20 minutes or until pierogi are heated through, and top is bubbly and golden.