How to make slow cooker potatoes au gratin (video)

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When I first discovered potatoes au gratin, I didn’t even know how to pronounce it (many would argue I still don’t, but according to the internet it’s “oh grah ton”). It was at a French restaurant that was known for its home-style meals, and at first bite I was hooked.
At the time, I had thought it was out of my reach. It was this fancy dish I ate at a restaurant, and I thought you absolutely needed an oven to make it. I lacked the skill and the oven to learn how to make this and so, for the longest time, it was simply one of those dishes that escaped my grasp.
But now, here I am on my slow cooker quest to make everything I love to eat using nothing but my slow cooker. Potatoes au gratin, we meet again, and this time it seems that I have prevailed!
Potatoes au gratin
30 minutes
3 hours
3 hours, 30 minutes
5 medium-sized potatoes
Salt, to taste
Pepper, to taste
3 tablespoons of butter
3 tablespoons white flour
1 clove of garlic (peeled and minced)
1 onion (peeled and sliced)
1 cup of milk
1 cup shredded cheddar cheese
Chives (as much as you like, I love chives and am embarrassed to say how much I use)
Wash and peel your potatoes. I've heard a lot of people just peel their potatoes without washing them because iif you're going to peel the skin off, why wash them? Well let's see potatoes grow in the DIRT and they are DIRTY. Seems like common sense, but if you don't wash them BEFORE peeling them, you'll get little specs of dirt on your peeled potatoes. Wash your potatoes people.
Slice potatoes into discs, roughly half a centimeter thick. For all my non-metric friends out there, think 2-3 silver dollars stacked on top of each other.
Line the bottom of your slow cooker pot with the first layer of potato slices, add salt and pepper to your taste or dietary liking, then add the next layer of potato slices and add salt and pepper again. Repeat this process until youre out of potato slices or you get tired of doing it, whichever comes first.
Melt butter in a pot set on medium heat. As soon as the butter is melted, whisk in flour until the mixture becomes thick and doughy. Add sliced onions and minced garlic. Keep on whisking and gradually add the milk.
Add the shredded cheese and continue whisking until you have something thick, but smooth, or get tired of whisking, whichever comes first. Lets be real, having pockets of semi-melted cheese in your dish can be a treat.
Pour your cheese sauce into the slow cooker pot on top of the layered potatoes. You may need to tip the pot back and forth so the sauce gets everywhere.
Cook on high in the slow cooker for ~3 hours, and then check every 15-30 minutes until you can easily poke through the potatoes with a fork (in the future, just remember how much time it took your slow cooker to get it perfect and you wont need to do this again.) Use chives for garnish.
Pro-tip: One of the big complaints of preparing potatoes au gratin in a slow cooker is that it’s hard to get a particularly crispy top layer, and that is the primary benefit of preparing this dish with an oven instead of a slow cooker. Honestly, though, I don’t find having a crisp top layer necessary to having a tasty potatoes au gratin dish.
Pro-tip: It’s much more important to not overcook the potatoes beneath the top layer so that your potatoes au gratin don’t come out too mushy. With that in mind, depending on your slow cooker, your potatoes might be done before 3 hours is up, so if you’ve always found your cooker to cook things faster, adjust the cook time accordingly.
Note: All slow cookers are a little bit different in temperature and calibration. This recipe was tested in Cooktop Cove's Test Kitchen using this slow cooker, which is available for purchase here.
Disclosure: This post contains affiliate links which help support our website.
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