Leftover Corned Beef Au Gratin Potatoes Recipe

One of my favorite things about every single holiday is the leftovers. You could not pick a better meat to use in cheesy potatoes than leftover corned beef. This Corned Beef Au Gratin Recipe is a great way to use up all the meat and stretch your dollar while also enjoying every last bite!

Some things are just hard to make in small amounts, and corned beef is definitely in that category. We always bake a large corned beef for St. Patrick’s Day so that we have leftovers. And leftovers can be made into delicious second or third meals, which saves time and money. Make our Corned Beef Potatoes Au Gratin and you’ll be putting that extra meat to good use.

Why You’ll Love Corned Beef Potatoes Au Gratin

• Easy to make and quick! Cheesy homemade Au Gratin Potatoes loaded with rich salty leftover Corned Beef is a perfectly balanced one-dish meal ready in less than 30 minutes. If you have extra time, add a salad for greens and fresh home-baked bread and you are golden!
• Uses leftovers. If there is one thing I cannot stand, it’s letting good leftovers go to waste. That’s why finding dishes to make for dinner that use leftover meat is genius. Plus, it saves you time because the meat is already cooked.
• Tastes amazing. Cheesy potatoes are the bomb. Cheesy Corned Beef and Potatoes is next level. Yum. It’s versatile. You can serve Potato Au Gratin as a delicious dinner or as a great side dish the whole family will love.

What’s the difference between Au Gratin and Scalloped Potatoes?

Au gratin potatoes have cheese baked on top to get that crispy, melty deliciousness. Scalloped potatoes are just sliced potatoes baked in a creamy sauce – no cheese. So au gratin is cheesy, scalloped is creamy. Same idea of sliced potatoes baked in an amazing sauce, but au gratin takes it up a notch with that cheesy sauce often called a bechamel. Now I’m hungry!

Ingredients you’ll need for this recipe

• Potatoes. We’ll give you some great potato options.
• Cheddar Cheese. Cheddar melts beautifully and adds such a delicious flavor.
• Gouda Cheese. Smoked gouda is especially nice!
• Heavy Cream. You can use either heavy cream or heavy whipping cream, which vary only slightly in fat content and are interchangeable. Some grocery stores only carry one or the other.
• Corned Beef Brisket. This should be already cooked.
• Butter. Unsalted butter is a good idea for this dish.
• Flour. To thicken the sauce.
• Salt and Pepper. To taste. You might need to go easy on the salt because of the corned beef.

How To Make Corned Beef Potatoes Au Gratin

Please note, that the printable recipe card has the full list of ingredients, quantities, complete instructions, and nutritional information. The following is a quick overview of the recipe.

Step One. Get ready to make your Corned Beef Au Gratin Recipe.

Preheat the oven and spray your baking dish. Set the pan aside.

Step Two. Cook the potatoes in cream.

In a large Dutch oven, melt the butter and whisk in the flour to make a rue. Now add 1/4 cup of the cream and whisk until thickened. Add the remaining cream.

Add the sliced potatoes and cook for fifteen minutes over a medium-high heat. They will be finished in the oven. This speeds the process up.

Step Three. Add the remaining ingredients except the reserved cheddar for the top.

Add the gouda cheese, half of the cheddar cheese, and the diced corned beef. Stir to combine.

Step Four. Bake your Corned Beef Potatoes Au Gratin.

Pour all of the ingredients into the casserole dish. Top with remaining cheddar cheese. Bake.

Frequently Asked Questions

What kind of potatoes should you use for au grautin?

A good starchy potato is best. Red potatoes russets and Yukon gold potatoes are great options. They will not become too soft while baking.

How To Reheat & Store this Corned Beef Au Gratin Recipe

Best way to store corned beef with potato

This dish should be refrigerated in an airtight container and used within a few days. When storing food, you have to remember the age of the ingredients. If you baked your corned beef 2 days ago, and it’s ok to store for 5 days, you only have 3 days in which to consume your new dish.

There’s nothing wrong with dicing up the corned beef putting it in serving-sized containers and freezing it. That will give you more options for using it.

Can I freeze au gratin?

Yes, you can freeze potato gratin. You can, however, the texture of the creamy sauce and cheese will change and could make the dish unpalatable.

How to reheat au gratin corned beef?

The easiest way to reheat this dish is in the microwave until it is hot and bubbly. A single serving should only take two or three minutes.

Variations

• Top with toasted bread crumbs or potato chips.
• Add veggies! Green peppers and a white onion are an ideal way to add flavor.
• This recipe works great with ham, ground beef, or sausage, instead of corned beef for a whole new hearty meal.
• We love cheddar but other semi-soft cheeses such as Colby, Swiss cheese, or Grueyere would be delicious.

Hostess Tips for Corned Beef Potatoes Au Gratin

• Use a mandolin slicer! You will have perfect potato slices in a fraction of the time. If you don’t have one, put it on your wish list. Slicing your potatoes the same thickness will guarantee that they bake evenly and your dish is finished baking as soon as possible. If you don’t have a mandoline slicer or mad knife skills, be sure to check the potatoes in several areas of the dish for doneness.
• You do not have to peel the potatoes. Scrub them well and leave them on for a more rustic take.
• You can prepare this dish a day ahead of time! Get it all ready and place it in the fridge, covered. About an hour before you want to bake the corned beef and potatoes, pull it from the fridge to warm up gently so that your pan does not break in the oven. Even if you are using a metal pan, letting it warm up a bit before putting it in a hot oven is a good idea.

Still looking for leftover recipes? Check these out!

Take a look at all of our delicious Corned Beef Recipes.

• Corned Beef and Cabbage Soup is a hearty soup recipe that is a great way to use leftover ingredients.
• Corned Beef Sandwich combines a sweet mustard sauce with a crunchy slaw that puts this great sandwich over the top. Especially when you put it on Sourdough Rye Bread or Pumpernickel bread!
• Corned Beef Breakfast Casserole is delicious for breakfast or dinner. Tender chunks of corned beef, potatoes, and cheese oh my!

I hope you enjoyed this delicious recipe as much as we do. Drop me a comment below, and don’t forget to give it a star rating. ⭐⭐⭐⭐⭐. Your comments and ratings help others decide if this recipe is for them too.

If you enjoyed this recipe check these out!

We love cooking with potatoes! So much goodness, and such a warm, comforting way to fill up hungry bellies. When you don’t know what to do with your potatoes, try making Roasted Garlic Fingerling Potatoes Recipe, our Sweet Potato Casserole, or these Twice baked potatoes. If you want to make something a bit more unusual and fancy, try Garlic-Basil Red Hasselback Potatoes. For one last fun option: Potato Rolls.

Did you enjoy this recipe? Don’t forget to pin it for later and follow me on Pinterest for more delicious recipes like this one!