This is one of those quiet, humble dishes that fed us through long Midwestern winters. My mom would put this on early Sunday morning before chores, and by the time we came back in with cold cheeks, the whole house smelled like sweet onions and butter. It’s just three ingredients, but the slow cooker does the work, turning plain potatoes and onions into something cozy and special. The onions melt down into a deep, caramelized tangle, and the potatoes get so tender you can almost scoop them with a spoon. If you grew up in the country or wish you had, this tastes like home.
These slow cooker caramelized onion potatoes are lovely alongside a simple roast chicken, meatloaf, or pork chops, and they’re right at home on a holiday table next to ham or turkey. Spoon some of the buttery onions over the top of the meat on your plate, and don’t be shy about a little extra salt and pepper at the table. A crisp green salad or steamed green beans balance the richness nicely, and any leftover potatoes reheat well in a skillet the next morning with eggs and a few slices of bacon.
Slow Cooker 3-Ingredient Caramelized Onion PotatoesServings: 6
Ingredients
3 pounds Yukon Gold potatoes, thinly sliced (about 1/4 inch)
3 large yellow onions, thinly sliced
1/2 cup (1 stick) unsalted butter, melted, plus extra for greasing the slow cooker
Directions
Lightly grease the bottom and sides of a 5- to 6-quart slow cooker with a little butter to keep the potatoes from sticking.
Peel the onions and slice them thinly from root to tip. Peel the potatoes if you like (I usually do) and slice them into 1/4-inch rounds so they cook evenly and get nice and tender.
Scatter a generous layer of sliced onions over the bottom of the slow cooker, covering it completely. This protects the potatoes and lets the onions cook low and slow until they turn deep golden and sweet.
Add a layer of sliced potatoes over the onions, overlapping them slightly like shingles. Sprinkle lightly with salt and pepper if you use them (not counted in the three ingredients).
Repeat the layers, alternating onions and potatoes, until everything is used, finishing with a layer of onions on top. The onions on top and bottom will get the most color and caramelization.
Pour the melted butter evenly over the onions and potatoes, letting it seep down into the layers. Use a spatula or clean hands to gently press everything down so it sits snugly in the slow cooker.
Cover the slow cooker with the lid and cook on LOW for 6 to 8 hours, without lifting the lid for at least the first 4 hours. The onions will slowly turn a deep amber color and the potatoes will become very soft and tender.
After about 6 hours, check a potato slice with a fork; it should be completely tender and almost falling apart. If you want more color and deeper onion flavor, let it go closer to 8 hours.
Once done, gently stir from the bottom with a wide spoon to pull some of the deeply caramelized onions up through the potatoes, coating everything in the buttery, glossy juices. Taste and adjust salt and pepper if needed.
Serve the potatoes and onions hot straight from the slow cooker, making sure each spoonful has plenty of those dark, sweet onions and buttery potatoes together.
Variations & Tips
For a slight twist without losing the spirit of the original, you can tuck in a few small touches my mom used from time to time. If you like a hint of smokiness, sprinkle a bit of smoked paprika or black pepper between the layers (she never counted seasonings as ingredients). A clove or two of minced garlic can be added with the onions for extra depth. If you prefer a richer finish, stir in a splash of cream or a spoonful of sour cream right at the end to make the potatoes almost saucy. To keep things lighter, you can cut the butter back to 6 tablespoons; the onions will still caramelize, just a bit more slowly. Russet potatoes will work in place of Yukon Golds, but they may break down more, almost like a rustic casserole. For a make-ahead option, slice the onions and potatoes the night before and keep them in separate covered containers in the refrigerator (cover the potatoes with cold water and drain well before layering). Leftovers reheat nicely in a skillet with a little extra butter until the edges crisp, or they can be mashed roughly with a fork for a caramelized onion potato mash.
