Slow Cooker Onion Butter Potatoes: A Simple, Budget-Friendly Comfort Side Dish

Published: February 20, 2026 | Servings: 6–8| Prep time: 5 minutes | Cook time: 4–6 hours (LOW) or 2–3 hours (HIGH) | Total time: Varies

If you need a simple, budget-friendly side dish that pairs with almost anything, these Slow Cooker Onion Butter Potatoes are a must-try. Made with tender baby potatoes, rich melted butter, and savory onion flavor, this crockpot potato recipe is perfect for busy weeknights, holiday dinners, and potlucks.

The potatoes cook low and slow, soaking up all the buttery onion flavor while staying tender and fluffy. The dry onion soup mix does all the heavy lifting, adding deep, savory flavor without any chopping or measuring. A little olive oil helps the seasonings cling, and the butter adds richness that makes these potatoes irresistible.

Serve them alongside roast chicken, pork chops, steak, ham, or a holiday turkey. They’re easy enough for a Tuesday night but special enough for Thanksgiving or Christmas dinner.

Why You’ll Love These Crockpot Butter Potatoes

Only a few simple ingredients – Potatoes, onion soup mix, butter, olive oil, garlic powder.
Budget-friendly comfort food – Potatoes and butter are affordable staples.
Perfect for meal prep – Make ahead and reheat.
Great for holidays & family dinners – A crowd-pleasing side dish.
Set-it-and-forget-it slow cooker recipe – No boiling, no mashing, no watching.
Rich, savory, buttery flavor – The onion soup mix adds incredible depth.

Ingredients

Baby potatoes (red or gold), halved if large– 3 pounds
Dry onion soup mix – 1 packet
Unsalted butter, sliced – ½ cup (1 stick)
Olive oil – 2 tablespoons
Garlic powder – 1 teaspoon
Black pepper – ½ teaspoon
Optional: Chopped parsley for garnish

Ingredient Notes

What kind of potatoes? Baby red or gold potatoes are ideal. They have thin skins that don’t need peeling and hold their shape well during slow cooking. If you can’t find baby potatoes, use Yukon Gold or red potatoes cut into 1½-inch chunks.

Do I need to peel the potatoes? No. The skins on baby potatoes are thin and tender. Just scrub them well before cooking.

What kind of onion soup mix? Any standard 1-ounce packet works. Lipton is the classic brand. The dry mix contains dehydrated onions, salt, beef bouillon, and spices. It adds immense flavor without any extra work.

Why olive oil? The olive oil helps the seasonings stick to the potatoes and adds a little extra richness. You can substitute vegetable oil or melted butter.

What kind of butter? Unsalted butter is best so you can control the salt level. The onion soup mix is already salty. If you only have salted butter, reduce or omit any additional salt.

Do I need to add any other seasonings? The onion soup mix is already well-seasoned. Garlic powder and black pepper are optional but recommended. A sprinkle of fresh parsley at the end adds color.

Do I need to grease the slow cooker? No. The butter and olive oil will prevent sticking.

Step-by-Step Instructions

Step 1: Prep the Potatoes

Wash and dry the 3 pounds of baby potatoes. If large, cut them in half (or into bite-sized pieces) for even cooking.

Step 2: Season

Place the potatoes in the slow cooker. Drizzle with 2 tablespoons of olive oil. Sprinkle 1 packet of dry onion soup mix, 1 teaspoon of garlic powder, and ½ teaspoon of black pepper over the top. Toss to coat evenly.

Step 3: Add Butter

Place ½ cup of sliced unsalted butter evenly across the top of the potatoes.

Step 4: Cook

Cover the slow cooker with the lid. Cook on:

LOW for 4 to 6 hours, or
HIGH for 2 to 3 hours

Stir once halfway through if possible. The potatoes are done when they are fork-tender.

Step 5: Garnish and Serve

Garnish with chopped fresh parsley if desired. Serve warm, straight from the slow cooker.

Pro Tips for Perfect Crockpot Potatoes

Use Yukon Gold potatoes for extra creaminess. Their naturally buttery flavor is a perfect match for this recipe.
Add shredded cheddar during the last 20 minutes for cheesy butter potatoes. Sprinkle 1 cup of shredded cheddar over the top, cover, and let it melt.
Sprinkle crispy bacon bits for a loaded potato version. Add cooked, crumbled bacon at the end.
Finish with fresh herbs for a gourmet touch. Parsley, chives, or thyme all work beautifully.
Don’t lift the lid during the first few hours of cooking. Each peek adds 15–20 minutes to the cooking time.
Stir once halfway through if possible to redistribute the butter and seasonings.

Variations & Tips

Make It Cheesy

Add 1 cup of shredded cheddar, Colby Jack, or Parmesan cheese during the last 20 minutes of cooking. Cover and let the cheese melt.

Make It with Fresh Herbs

Add 2 sprigs of fresh thyme or 1 tablespoon of fresh rosemary (chopped) to the slow cooker. Remove thyme sprigs before serving.

Make It Spicy

Add ½ teaspoon of red pepper flakes or ¼ teaspoon of cayenne pepper along with the other seasonings.

Make It with Bacon

Add ½ cup of cooked, crumbled bacon at the end. Stir in or sprinkle on top.

Make It with Sour Cream

Serve with a dollop of sour cream on the side. The cool, tangy cream balances the rich, buttery potatoes.

Make It in the Oven (No Slow Cooker)

Preheat oven to 375°F (190°C).
Toss potatoes with olive oil, onion soup mix, garlic powder, and pepper in a 9×13-inch baking dish.
Dot with butter.
Cover with foil and bake for 45 minutes.
Uncover and bake for another 15–20 minutes, until tender.

Make It in the Instant Pot

Add potatoes, olive oil, seasonings, and butter to the Instant Pot.
Add ½ cup of water.
Pressure cook on HIGH for 8 minutes.
Quick release.
Stir and serve.

Storage & Reheating

Refrigerator: Store leftovers in an airtight container for up to 5 days.

Reheating:

Microwave: 1–2 minutes per serving.
Skillet: Warm over medium-low heat, adding a splash of water or broth if needed.
Oven: 350°F for 10–15 minutes on a baking sheet.
Slow cooker: Warm on LOW for 30–45 minutes.

Freezing: Potatoes can become grainy when frozen. This dish is best enjoyed fresh or refrigerated.

Frequently Asked Questions (FAQs)

Can I use regular potatoes instead of baby potatoes?

Yes. Use Yukon Gold or red potatoes cut into 1½-inch chunks. The cooking time remains the same.

Do I need to peel the potatoes?

No. The skins on baby potatoes and Yukon Golds are thin and tender. Just scrub them well.

Why are my potatoes still hard after cooking?

A few possibilities:

Your potato chunks were too large (aim for bite-sized pieces)
Your slow cooker runs cool (some older models do)
You didn’t cook them long enough (check at the longer end of the time range)
You opened the lid too often (each peek adds 15–20 minutes)

Can I use salted butter instead of unsalted?

Yes. The onion soup mix is already salty, so the dish may be saltier. Consider reducing or omitting any additional salt.

What should I serve with these potatoes?

Roast chicken – A classic pairing
Pork chops – The buttery potatoes complement the savory pork
Steak – Rich and satisfying
Ham – Perfect for Easter or holiday dinners
Roast beef – A comforting combination

Can I double this recipe?

Use a 7- to 8-quart slow cooker for a double batch. Double all ingredients. Cooking time may increase by 30–60 minutes. Check for doneness when potatoes are fork-tender.

What to Serve With It

As a side dish:

These onion butter potatoes alongside roast chicken, pork chops, steak, ham, or roast beef

For a holiday meal:

These potatoes
Roast turkey or ham
Green beans almondine
Dinner rolls
Cranberry sauce

For a weeknight dinner:

These potatoes
A simple green salad
Crusty bread

For a potluck:

These potatoes in the slow cooker on WARM

Garnish ideas:

Fresh parsley
Fresh chives
Crumbled bacon
Shredded cheese
Sour cream

Why This Recipe Works

This simple slow cooker potato recipe is a perfect example of “less is more.” Here’s why it works so well:

Baby potatoes have thin skins and a creamy texture. They hold their shape during long cooking without falling apart.

Dry onion soup mix is a flavor powerhouse — dehydrated onions, beef bouillon, and spices all in one packet. It adds deep, savory flavor without any chopping.

Butter adds richness and helps create a silky, flavorful coating on the potatoes.

Olive oil helps the seasonings stick and adds a little extra richness.

Garlic powder and black pepper add aromatic depth.

The slow cooker provides gentle, even heat that allows the potatoes to absorb all the flavors without scorching.

The result is a side dish that’s simple, delicious, and practically effortless.

Final Thoughts

These Slow Cooker Onion Butter Potatoes are proof that the best side dishes don’t need to be complicated. Baby potatoes, onion soup mix, butter, and a few simple seasonings — that’s all it takes to create a dish that’s rich, savory, and deeply satisfying.

The slow cooker does all the work. The potatoes become tender and soak up all that buttery, oniony flavor. And the whole thing comes together with almost no effort.

Make them for a holiday dinner. Make them for a potluck. Or make them just because you’re craving simple, delicious potatoes that taste like comfort. Your family will ask for them again and again.