Some side dishes are so simple, so effortlessly delicious, that they become instant family favorites. These slow cooker French onion potatoes are exactly that. With just four ingredients—potatoes, onion soup mix, butter, and beef broth—you can create a rich, savory, deeply flavorful potato dish that tastes like you spent hours in the kitchen. The slow cooker does all the work, transforming humble potatoes into tender, buttery perfection infused with the unmistakable taste of French onion soup.
These slow cooker French onion potatoes are the ultimate hands-off side dish. Thinly sliced potatoes are layered with a simple mixture of dry onion soup mix, melted butter, and broth. As they cook low and slow, the potatoes absorb all that savory goodness, becoming soft, creamy, and incredibly flavorful. The edges caramelize slightly, adding a touch of sweetness. Serve them alongside roasted chicken, steak, pork chops, or a holiday ham. They are also wonderful as a vegetarian main course with a side salad.
Why You Will Love This Recipe
· Only Four Ingredients: Potatoes, onion soup mix, butter, and broth.
· True Dump-and-Go: No pre-cooking, no complicated steps.
· One Slow Cooker, Minimal Cleanup.
· Rich, Savory French Onion Flavor.
· Tender, Buttery Potatoes.
· Set It and Forget It: Perfect for busy days.
· Budget-Friendly: Uses affordable potatoes and pantry staples.
· Great for Holidays and Weeknights Alike.
Ingredients List
· 3 lbs (about 6 medium) Yukon Gold or russet potatoes, thinly sliced (⅛ to ¼ inch thick)
· 2 packets (1 oz each) dry onion soup mix (such as Lipton)
· ½ cup (1 stick) unsalted butter, melted
· 1 cup low-sodium beef broth
· Optional: 1 cup shredded Gruyère, Swiss, or provolone cheese (for topping)
· Optional: Fresh parsley for garnish
Step-by-Step Instructions
Step 1: Prepare the Potatoes
Peel the potatoes if desired (Yukon Golds can be left unpeeled; russets are best peeled). Using a sharp knife or a mandoline, slice the potatoes into thin, uniform rounds, about ⅛ to ¼ inch thick. Uniform slices ensure even cooking.
Step 2: Make the Onion Butter Mixture
In a small bowl, whisk together the melted butter, dry onion soup mix, and beef broth until well combined. The mixture will be thick and fragrant.
Step 3: Layer the Slow Cooker
Lightly grease a 6-quart or larger slow cooker with non-stick spray or a thin layer of butter. Place a single layer of potato slices on the bottom, overlapping slightly. Drizzle a small amount of the onion butter mixture over the potatoes. Repeat the layers (potatoes, then onion butter) until all the potatoes and mixture are used, ending with a drizzle on top.
Step 4: Cook
Cover and cook on LOW for 4 to 5 hours or on HIGH for 2 to 3 hours. The potatoes are ready when they are fork-tender and have absorbed most of the liquid.
Step 5: Add Cheese (Optional)
If using cheese, sprinkle it over the top during the last 15-20 minutes of cooking. Cover and let the cheese melt.
Step 6: Serve
Garnish with fresh parsley. Serve hot directly from the slow cooker.
Cooking Tips and Pro Tips for Best Results
· Use a mandoline for uniform slices: Evenly sliced potatoes cook at the same rate. A mandoline makes quick work of this and ensures consistent thickness. If using a knife, take your time.
· Yukon Gold vs. russet potatoes: Yukon Golds hold their shape better and have a naturally buttery flavor. Russets are starchier and will break down more, creating a softer, almost mashed texture. Both are delicious.
· Do not slice too thick: Slices thicker than ¼ inch may not cook through in the recommended time. Thin slices are key to tender, creamy results.
· Layer, do not stir: Layering ensures even cooking and flavor distribution. Stirring can break the potato slices.
· Do not add too much liquid: The potatoes release moisture as they cook. The butter and broth provide plenty of liquid. Adding more will result in a watery dish.
· For a crispy top: After slow cooking, transfer the potatoes to a baking dish, top with cheese and breadcrumbs, and broil for 2-3 minutes until golden.
· Keep warm for serving: Set the slow cooker to WARM after cooking. The potatoes will stay hot for up to 2 hours.
Variations and Substitutions
Cheesy French Onion Potatoes:
Add 1 cup of shredded Gruyère, Swiss, provolone, or mozzarella cheese during the last 15-20 minutes of cooking. The cheese adds a rich, nutty, melty topping.
Creamy French Onion Potatoes:
Add ½ cup of heavy cream or sour cream along with the broth. The cream makes the potatoes extra rich and luxurious.
French Onion Potatoes with Mushrooms:
Add 8 oz of sliced cremini mushrooms along with the potato layers. The mushrooms add an earthy, umami depth.
Garlic French Onion Potatoes:
Add 4 cloves of minced garlic to the onion butter mixture. The garlic adds a savory, aromatic punch.
Herbed French Onion Potatoes:
Add 1 teaspoon of dried thyme or rosemary to the onion butter mixture. The herbs add an earthy, fragrant note.
Slow Cooker Scalloped Potatoes (No Soup):
Omit the onion soup mix and use 1 teaspoon of garlic powder and 1 teaspoon of onion powder instead. Add ½ cup of grated Parmesan cheese to the layers.
Serving Suggestions
These slow cooker French onion potatoes are incredibly versatile. Serve them alongside:
· Roasted Chicken or Turkey: A classic holiday pairing.
· Steak or Beef Roast: The rich, savory flavors complement beef beautifully.
· Pork Chops or Ham: Buttery potatoes with sweet, salty pork.
· Meatloaf or Meatballs: A comforting, hearty combination.
They also work well as:
· A vegetarian main course with a side salad
· A breakfast side with eggs and bacon
· A topping for shepherd’s pie
Pair with:
· Roasted green beans or asparagus
· A simple green salad with vinaigrette
· Crusty bread for sopping
Storage and Reheating Instructions
Refrigerator:
Store leftovers in an airtight container for up to 5 days. The potatoes will soften further, but the flavor remains excellent.
Freezer:
Freezing is not recommended for this dish. The texture of the potatoes becomes grainy and watery upon thawing.
Reheating:
· Oven (Best): Transfer to a baking dish, cover with foil, and bake at 350°F for 15-20 minutes.
· Microwave: Heat individual portions covered for 60-90 seconds.
· Skillet: Reheat in a covered non-stick skillet over medium-low heat for 5-7 minutes.
Nutritional Information (Approximate, per serving – serves 6)
· Calories: 320
· Protein: 5g
· Fat: 16g
· Saturated Fat: 10g
· Carbohydrates: 40g
· Fiber: 4g
· Sugar: 5g
· Sodium: 980mg (varies by onion soup mix)
· Potassium: 890mg
· Vitamin C: 20% Daily Value
Frequently Asked Questions (FAQ)
1. Can I use red potatoes instead of Yukon Gold or russet?
Yes. Red potatoes are waxy and will hold their shape very well. They will be firmer than Yukon Golds or russets. The cooking time remains the same. Avoid using very large baking potatoes, which can be mealy.
2. Do I need to peel the potatoes?
Peeling is optional. Yukon Gold and red potatoes have thin, tender skins that are fine to leave on for a more rustic dish. Russet potatoes have thicker, tougher skins and are best peeled. If leaving skins on, scrub the potatoes thoroughly.
3. Why are my potatoes still hard after cooking?
Hard potatoes usually mean they were sliced too thick or the cooking time was too short. Slice potatoes no thicker than ¼ inch. If they are still hard at the end of the recommended time, cover and continue cooking on high for another 30-60 minutes.
4. Can I make this recipe in the oven instead of a slow cooker?
Yes. Preheat the oven to 375°F (190°C). Layer the potatoes and onion butter mixture in a greased 9×13 baking dish. Cover with foil and bake for 45 minutes. Uncover and bake for another 15-20 minutes, until the potatoes are tender and the top is golden.
5. How do I prevent the potatoes from turning brown while I slice them?
If you are slicing a large quantity of potatoes and are worried about browning, place the sliced potatoes in a bowl of cold water. This removes excess starch and prevents oxidation. Drain and pat dry thoroughly before layering in the slow cooker.
6. Is this recipe gluten-free?
Most dry onion soup mixes contain gluten (often in the form of hydrolyzed wheat protein or maltodextrin). Look for a gluten-free onion soup mix or make your own (see below). The rest of the ingredients are naturally gluten-free.
Homemade Gluten-Free Onion Soup Mix:
Combine ¼ cup dried minced onion, 2 tablespoons beef bouillon powder (gluten-free), 1 teaspoon onion powder, ½ teaspoon parsley flakes, ½ teaspoon celery seed, ½ teaspoon paprika, and ¼ teaspoon black pepper. Use 2 tablespoons of this mix in place of one packet. Store the rest in an airtight jar.