Slow Cooker 3-Ingredient Onion Roasted Potato Foil Packets
If you’re looking for an easy slow cooker potato recipe that delivers big flavor with minimal effort, these 3-ingredient onion roasted potato foil packets are the answer. This simple crockpot side dish uses tender potatoes, savory onion soup mix, and butter to create perfectly seasoned, melt-in-your-mouth potatoes every single time.
This is the ultimate set-it-and-forget-it slow cooker side dish perfect for busy weeknights, Sunday dinners, potlucks, or holiday meals when your oven is full.
Why You’ll Love This Slow Cooker Potato Recipe
Only 3 simple ingredients
Budget-friendly and family-approved
Minimal prep and cleanup
Perfect make-ahead side dish
Naturally gluten-free (check soup mix label)
The foil packet method locks in moisture, allowing the onion seasoning to fully absorb into the potatoes. The result? Tender, buttery, savory crockpot potatoes with almost zero hands-on time.
Ingredients (Serves 4):
2 pounds small red or yellow potatoes, scrubbed and cut into 1-inch chunks
1 (1-ounce) packet dry onion soup mix
4 tablespoons unsalted butter (1 tablespoon per foil packet)
Directions:
Set a 5- to 6-quart slow cooker on your counter. Tear four sheets of heavy-duty aluminum foil (12–14 inches long). If using regular foil, double-layer to prevent tearing.
In a large bowl, toss potato chunks with dry onion soup mix until evenly coated. No extra oil needed the potatoes release natural moisture during cooking.
Pro Tip: Make sure every piece is coated for maximum flavor infusion.
Divide the seasoned potatoes evenly among the foil sheets. Place 1 tablespoon of butter on top of each pile.
Fold foil tightly to trap steam. Proper sealing ensures the potatoes steam perfectly and absorb the savory onion flavor.
Place packets seam-side up in the slow cooker. Cover and cook:
HIGH: 3–4 hours
LOW: 6–7 hours
Potatoes are done when fork-tender.
Carefully open packets (watch for steam). Toss potatoes in melted butter and onion juices before serving.
Benefits of Cooking Potatoes in Foil Packets
Even Cooking: Steam circulates inside each packet.
Maximum Flavor Absorption: Onion seasoning penetrates every bite.
Portion Control: Individual servings make hosting easy.
Less Cleanup: No baking dishes to scrub.
Serving Ideas:
These easy crockpot roasted potatoes pair beautifully with:
Grilled chicken
Baked chicken thighs
Roast beef
Stuffed peppers
Fresh green salad
Steamed green beans
They’re also perfect for meal prep, tailgates, and potlucks.
Variations & Expert Tips:
Crispy Finish: After slow cooking, open packets and broil 3–5 minutes for golden edges.
Garlic Upgrade: Swap onion soup mix for roasted garlic & onion blend.
Herb Boost: Add dried rosemary or thyme before sealing.
Lighter Version: Reduce butter to 2 tablespoons total.
Breakfast Hack: Flatten leftovers in a skillet for crispy onion home fries.
