Also on the back of the box, they have great recipies to try. Here is a recipe I've already tried. Thaw one dozen pierogies in boiling water 3-5 mins. You will also need 1 bag mixed frozen veggies, cauliflower, carrots etc. Brown ground beef halfway through,add Taco seasoning.
Place pierogies in one flat layer in bottom of the casserole dish.
Add meat, then the veg. Bake in 350 oven 20 to 30 mins. Dinner rolls or garlic toast will go well with this dish. I would love to try it.