Make and share this Steam N' Mash Pierogi Casserole recipe from Food.com.
Category: not set
Cuisine: not set
2 packages frozen mashed potatoes (Steam n' Mash Russet Potat made according to package directions)
1 lb cheddar cheese shredded
0.5 box lasagna noodles cooked al dente
1 cup unsalted butter
4 vidalia onions chopped
salt to taste
pepper to taste
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