3-Ingredient Slow Cooker Potatoes and Onions

These 3-Ingredient Slow Cooker Potatoes and Onions are tender, buttery, deeply savory, and incredibly easy to prepare.

 

 

 

 

Thinly sliced potatoes cook slowly with sweet onions and melted butter until every piece becomes soft, golden, and coated with flavorful juices.

 

 

 

 

The slow cooker allows the onions to soften gradually while the potatoes absorb their natural sweetness. The result is a comforting side dish made with inexpensive ingredients and almost no active cooking time.

 

 

 

 

This recipe is ideal for busy weeknights, Sunday dinners, holiday meals, potlucks, or any day when you need an easy potato dish that can cook while you focus on something else.

 

 

 

 

Serve the potatoes with roasted chicken, beef, pork chops, sausage, meatloaf, eggs, or grilled vegetables.

 

 

 

 

Why This Recipe Is Popular

 

 

 

 

Slow Cooker Potatoes and Onions are popular because they use simple ingredients that are available in almost every grocery store.

 

 

 

 

Potatoes are affordable, filling, and easy to season. Onions add sweetness and savory flavor, while butter keeps everything moist and rich.

 

 

 

 

The preparation takes only a few minutes. Once the ingredients are inside the slow cooker, the appliance handles most of the work.

 

 

 

 

This recipe is also useful when the oven is already occupied with another dish. The potatoes cook gently without requiring a baking sheet, frying pan, or constant stirring.

 

 

 

 

The finished dish works as a breakfast side, dinner accompaniment, holiday potato recipe, or simple meal when served with eggs or sausage.

 

 

 

 

Recipe Information

 

 

 

 

The preparation time is approximately fifteen minutes.

 

 

 

 

The cooking time is four to five hours on Low or two to three hours on High.

 

 

 

 

The total time is approximately four hours and fifteen minutes when using the Low setting.

 

 

 

 

This recipe provides approximately six servings.

 

 

 

 

The Three Main Ingredients

 

 

 

 

You will need two and a half pounds of Yukon Gold or baby potatoes, two large yellow onions, and six tablespoons of unsalted butter.

 

 

 

 

Salt, black pepper, garlic powder, paprika, or herbs can be added according to taste, but the main recipe is built around potatoes, onions, and butter.

 

 

 

 

Using salted butter is also possible. Reduce any additional salt until the dish has been tasted.

 

 

 

 

The Best Potatoes to Use

 

 

 

 

Yukon Gold potatoes are an excellent choice because they have a naturally buttery flavor and hold their shape well during slow cooking.

 

 

 

 

Baby yellow potatoes also work beautifully and can be sliced into thick rounds.

 

 

 

 

Russet potatoes may be used, but they contain more starch and can become softer or begin breaking apart after several hours.

 

 

 

 

Red potatoes remain firm and create a slightly waxier texture.

 

 

 

 

Choose potatoes that feel firm and have no large sprouts, deep bruises, mold, or green areas.

 

 

 

 

Potatoes of similar size are easier to slice evenly and cook at the same speed.

 

 

 

 

Should You Peel the Potatoes?

 

 

 

 

Peeling is optional.

 

 

 

 

Yukon Gold and baby potatoes have thin skins that can remain on the potatoes.

 

 

 

 

Keeping the skins saves preparation time and adds texture.

 

 

 

 

When leaving the skins on, scrub the potatoes thoroughly under cool running water.

 

 

 

 

Remove any damaged areas with a small knife.

 

 

 

 

Russet potatoes have thicker skins and may be peeled for a smoother texture.

 

 

 

 

The recipe will work either way, so choose the preparation that your family prefers.

 

 

 

 

How Thick Should the Potatoes Be Sliced?

 

 

 

 

Slice the potatoes into rounds approximately one-quarter inch thick.

 

 

 

 

Even slices are important because very thin pieces may become overly soft while thicker pieces may remain firm.

 

 

 

 

A sharp chef’s knife works well.

 

 

 

 

A mandoline slicer can create very even rounds, but it must be used carefully with the safety guard.

 

 

 

 

Do not slice the potatoes paper-thin.

 

 

 

 

The slow cooker cooks with trapped moisture, so the potatoes need enough thickness to hold their shape.

 

 

 

 

Choosing the Best Onions

 

 

 

 

Yellow onions are the most versatile choice for this recipe.

 

 

 

 

They become sweet and mild while cooking and pair naturally with butter and potatoes.

 

 

 

 

Sweet onions can also be used when you prefer a softer and sweeter flavor.

 

 

 

 

White onions create a slightly sharper taste.

 

 

 

 

Red onions will work, but their color may change during cooking and give the dish a different appearance.

 

 

 

 

Slice the onions into thin strips or half-moons so they soften evenly among the potatoes.

 

 

 

 

Why Butter Works So Well

 

 

 

 

Butter melts slowly and coats the potatoes as they cook.

 

 

 

 

It adds richness, prevents the vegetables from tasting dry, and helps carry the flavor of the onions through the entire dish.

 

 

 

 

Unsalted butter gives you better control over the seasoning.

 

 

 

 

Salted butter is convenient but may make the recipe salty when additional seasoning is added.

 

 

 

 

For a lighter version, part of the butter can be replaced with olive oil.

 

 

 

 

However, using only olive oil will create a different flavor and may not provide the same comforting richness.

 

 

 

 

Prepare the Slow Cooker

 

 

 

 

Lightly coat the inside of a five- or six-quart slow cooker with butter or nonstick cooking spray.

 

 

 

 

This step helps prevent the potatoes around the edges from sticking.

 

 

 

 

A slow-cooker liner can also be used for easier cleanup.

 

 

 

 

Avoid using a cooker that is much too large for the quantity of potatoes.

 

 

 

 

The ingredients should fill a reasonable portion of the cooking insert so they remain moist and cook evenly.

 

 

 

 

Wash and Slice the Potatoes

 

 

 

 

Wash the potatoes carefully.

 

 

 

 

Peel them when desired.

 

 

 

 

Slice them into even rounds.

 

 

 

 

Place the sliced potatoes inside a large bowl while preparing the onions.

 

 

 

 

If the potatoes must sit for more than a few minutes, cover them with cold water to reduce discoloration.

 

 

 

 

Drain and dry them thoroughly before adding them to the slow cooker.

 

 

 

 

Excess water can make the finished dish too wet.

 

 

 

 

Slice the Onions

 

 

 

 

Peel the onions and cut them in half from top to bottom.

 

 

 

 

Slice each half into thin half-moons.

 

 

 

 

Separate the layers gently with your fingers.

 

 

 

 

Thin onion slices cook more evenly and distribute their flavor throughout the potatoes.

 

 

 

 

Very thick onion pieces may remain firmer and create stronger bites.

 

 

 

 

Layer the Ingredients

 

 

 

 

Arrange approximately one-third of the sliced potatoes across the bottom of the slow cooker.

 

 

 

 

Add one-third of the sliced onions.

 

 

 

 

Place small pieces of butter over the vegetables.

 

 

 

 

Repeat the layers until all the potatoes, onions, and butter have been used.

 

 

 

 

Layering helps distribute the onion and butter more evenly than placing everything in one large pile.

 

 

 

 

The upper layer should receive a few pieces of butter so they melt over the potatoes as cooking begins.

 

 

 

 

Add Simple Seasoning

 

 

 

 

Sprinkle salt, black pepper, and garlic powder lightly between the layers when desired.

 

 

 

 

A good starting point is one teaspoon of salt, half a teaspoon of black pepper, and one teaspoon of garlic powder for the entire recipe.

 

 

 

 

The seasoning can be adjusted after cooking.

 

 

 

 

Avoid adding too much salt at the beginning, especially when using salted butter.

 

 

 

 

Paprika can be added for color and a mild smoky flavor.

 

 

 

 

Dried thyme or rosemary also pairs well with potatoes and onions.

 

 

 

 

Cook on Low

 

 

 

 

Cover the slow cooker with the lid.

 

 

 

 

Cook the potatoes on Low for approximately four to five hours.

 

 

 

 

Begin checking them near the four-hour mark.

 

 

 

 

Insert a fork into one of the thickest slices.

 

 

 

 

The potatoes should feel tender without completely falling apart.

 

 

 

 

Cooking on Low usually creates the most even texture and allows the onions to soften gradually.

 

 

 

 

Cook on High

 

 

 

 

When you need the potatoes sooner, cook them on High for approximately two to three hours.

 

 

 

 

Begin checking after two hours.

 

 

 

 

The exact cooking time depends on the thickness of the potato slices and the power of the appliance.

 

 

 

 

Potatoes near the outside may soften faster than those in the center.

 

 

 

 

Stir gently near the end when necessary, but avoid stirring repeatedly because the slices may break apart.

 

 

 

 

Keep the Lid Closed

 

 

 

 

The slow cooker depends on trapped heat and steam.

 

 

 

 

Opening the lid repeatedly allows heat to escape and increases the cooking time.

 

 

 

 

Avoid checking the potatoes during the first two hours on Low or the first hour on High.

 

 

 

 

When checking near the end, replace the lid promptly.

 

 

 

 

Stir the Potatoes Carefully

 

 

 

 

The potatoes can be stirred once near the end of the cooking time.

 

 

 

 

Use a wide spoon or silicone spatula.

 

 

 

 

Lift the bottom pieces gently and move them toward the top.

 

 

 

 

Avoid aggressive stirring because fully cooked potato rounds can break easily.

 

 

 

 

The butter and onion juices should coat the potatoes as they are turned.

 

 

 

 

How to Know When the Potatoes Are Ready

 

 

 

 

The potatoes are ready when a fork slides easily through the center.

 

 

 

 

The onions should appear soft, translucent, and lightly golden.

 

 

 

 

There may be a small amount of buttery liquid at the bottom of the slow cooker.

 

 

 

 

This liquid is flavorful and can be spooned over the potatoes before serving.

 

 

 

 

The potatoes should not be completely mashed unless you prefer a softer result.

 

 

 

 

Allow the Potatoes to Rest

 

 

 

 

Turn off the slow cooker and leave the lid slightly open.

 

 

 

 

Allow the potatoes to rest for approximately ten minutes.

 

 

 

 

This gives the buttery juices time to settle and reduces the chance of the slices breaking during serving.

 

 

 

 

Taste one potato and adjust the salt, pepper, or herbs when needed.

 

 

 

 

Simple Recipe Overview

 

 

 

 

Wash and slice the potatoes into even rounds.

 

 

 

 

Slice the onions thinly.

 

 

 

 

Layer the potatoes, onions, and butter inside the slow cooker.

 

 

 

 

Add simple seasoning according to taste.

 

 

 

 

Cover and cook until the potatoes are tender.

 

 

 

 

Stir gently near the end and serve the dish warm.

 

 

 

 

Tips for the Best Slow Cooker Potatoes

 

 

 

 

Keep the potato slices close to the same thickness.

 

 

 

 

Use Yukon Gold or baby potatoes when you want the slices to hold their shape.

 

 

 

 

Layer the butter and onions rather than placing them only on top.

 

 

 

 

Avoid adding unnecessary water because the onions and potatoes naturally release moisture.

 

 

 

 

Keep the lid closed during most of the cooking time.

 

 

 

 

Check the potatoes near the early end of the cooking range to avoid overcooking.

 

 

 

 

Stir gently and serve the potatoes while warm.

 

 

 

 

Common Mistakes to Avoid

 

 

 

 

Do not slice some potatoes very thin and others very thick.

 

 

 

 

Avoid adding a large amount of broth or water because the slow cooker traps moisture.

 

 

 

 

Do not overcrowd a very small cooker.

 

 

 

 

Avoid cooking the potatoes for many hours after they become tender.

 

 

 

 

Do not stir them aggressively once they are fully cooked.

 

 

 

 

Taste the finished dish before adding more salt