A Make Ahead Masterpiece Cheesy Onion Mashed Potato Casserole is a make ahead masterpiece made with savory, sautéed onions and cheese. Cottage cheese makes these potatoes extra cheesy and it bakes up light and fluffy to become the perfect side to any meat dish. This Cheesy Onion Mashed Potato Casserole actually tastes very similar to the inside of some of my favorite pierogis. I love this casserole because you can assemble it the day before you need it and pop it in the oven while your roasted meat rests before slicing in. These potatoes are perfect for a Sunday dinner…
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