Cover the baking dish tightly with foil to help the potatoes steam and get tender. Place the dish on the center rack of the preheated oven and bake for 50β60 minutes, until the potatoes are mostly tender when pierced with a fork.
Carefully remove the foil (watch for steam), then return the uncovered casserole to the oven and bake for another 20β25 minutes, or until the top is bubbly, lightly browned around the edges, and the potatoes are completely tender. The sauce should be thickened and creamy, not runny.
Let the casserole rest on the counter for about 10β15 minutes before serving. This short rest helps the layers settle so you can scoop out neat, hearty portions with a big spoon. Serve warm, straight from the dish, and donβt be surprised if everyone goes back to scrape the last bits of creamy sauce from the corners.
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