Mashed potatoes are one of the coziest (and tastiest) dishes on this great big globe, but if you happen to make too big a batch, they tend to lose some of their luster when you reheat them. They lose some of their comforting creaminess and fluff and they’re just not as well suited as they once were for tucking into a bowl topped with hot gravy. But! They are still excellent in baked dishes like this.
Now, there’s no shortage of great recipes to use up leftover mashed potatoes. You’ve got moussaka, shepherds pie, mashed potato puffs, potato pancakes… but this beefy, cheesy, comforting casserole is our go-to. This Cheesy Spinach Mashed Potato Casserole is a whole meal in one baking dish and it takes mere minutes of effort before it’s off to the oven.
It’s so good that you can just go ahead and make mashed potatoes from scratch purely in the interest of making this. We’ve done that a time or two… or at least made extra in anticipation of this for the next night’s dinner. You want the potatoes to be rich and buttery and not too dense, so if they’ve thickened up in the fridge a bit, you can thin them out with some heavy cream before spreading them into the baking dish.
A layer of seasoned ground beef and spinach are sandwiched by those creamy mashed potatoes and the whole thing is topped with some crunchy breadcrumbs and parmesan. It’s one of our favorite casseroles out there. We think you’ll feel the same way.
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