Mashed Potato Casserole

Choosing between classic creamy mashed potatoes and a fully loaded mashed potato casserole is no small decision. One is simple and comforting; the other is bold, indulgent, and completely unapologetic. I fully understand that there is a time and place for the former. But sometimes, more is just—well—more. That’s when I turn to an over-the-top potato dish like this casserole. It’s got smoky bacon, two kinds of cheese, crispy fried onions, and potato chips. Yes, potato chips. This mashed potato casserole is ridiculous in the best way possible.

And once you see what goes into it, you'll understand exactly why this casserole is so hard to resist. The cooked potatoes are mashed, then combined with things like creamy onion dip, crispy bacon, cheese, and fried onions. Everything goes into a casserole dish and is topped with more cheese, more fried onions, and kettle-cooked potato chips. Oh my heavens, is it wonderful. This dish goes well with Thanksgiving turkey, Christmas ham, or just a good steak dinner!

What kind of potatoes are best for mashed potatoes?

There are a few different types of potatoes you can use for mashed potatoes, but my favorites are russets and Yukon Golds. Both are high in starch and mash up nicely. For this recipe, I use russet potatoes because they tend to be a little lighter and fluffier when mashed. Yukon Golds would work great too, so use what you like best!

Can you make mashed potato casserole ahead of time?

You sure can! This potato side dish can be made up to two days ahead of time, covered with foil, and refrigerated (unbaked). Wait to mix up the topping and add it just before you pop the casserole in the oven so the onions and chips stay crunchy.

Can you freeze mashed potato casserole?

Yes. While many potato dishes don’t freeze and thaw well, the butter and cream in this recipe help the potatoes keep their creamy texture. Tightly wrap the unbaked mashed potato casserole (without the toppings) in plastic wrap, then freeze it for up to two weeks. Thaw it in the fridge overnight, add the topping, and bake as directed.

Can mashed potato casserole be vegetarian?

Absolutely! Just skip the crumbled bacon, and it’s a great vegetarian side dish.