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Sauté diced onions briefly with butter, seasoned with salt, pepper, and garlic powder.
Incorporate heavy cream, milk, a pinch of nutmeg, and a generous amount of shredded white cheddar along with Parmesan cheese.
Combine the mixture with partially thawed hash browns, then pour into a greased 9x13 casserole dish.
For an impressive finish, bake until bubbly, then broil briefly for a golden crust.
Pro Tips:
Make ahead: Prepare, cover, and refrigerate overnight.
No need for complicated ingredients—just rich, flavorful, and comforting.
This dish closely resembles scalloped potatoes but is faster to prepare and indulgent enough for a holiday feast.