30 Minute Buttery Grilled Potatoes With Garlic and Herbs

These ultra-creamy, garlic-infused grilled potatoes are sliced thin and double-wrapped in heavy-duty foil to lock in moisture, creating a perfect steam chamber before caramelizing on the grill in just 30 minutes.

I still have a tiny, faint white line on my left thumb from a cheap foil packet that tore open over a scorching grill.

Inside that leaky foil sat a heap of red potatoes that were simultaneously charred to carbon on the outside and completely raw, chalky, and unforgiving in the center. I ended up scraping them into the trash and eating potato chips for dinner.

Most backyard grillers throw raw spuds into foil with a pat of butter and pray, but the physics of this method is fundamentally flawed. Potatoes require starch gelatinization to soften, which happens at around 137°F to 150°F, but without controlled steam, the outer layers burn long before the core cooks through. If you've ever tried making roasted potatoes with baked feta and garlic, you know that dry heat is the key to crispiness, but foil packets require a completely different thermodynamic approach.

I tested this with cheap store-brand foil, and it failed every single test because it lacks the thermal mass to distribute heat evenly.

It got annoying fast.

Trust me on this one: the simple fix is slicing your potatoes to a uniform one-quarter inch thickness and using a double layer of heavy-duty foil. This traps the moisture, allowing the potatoes to steam in their own juices before the butter caramelizes the edges. While I love the crunch of crispy wedges, this foil packet method is all about achieving a velvety, melt-in-your-mouth interior.

This is hands down the easiest way to get creamy, garlic-infused spuds without turning on your oven.

Serving Suggestions

These buttery spuds are incredibly versatile and pair beautifully with almost any grilled protein. Here are a few of our favorite ways to serve them to complete your backyard feast:

• Alongside a juicy steak, or even as a quick alternative to our Slow Cooker Garlic Butter Ribeye with Parmesan Mashed Potatoes.
• They make a fantastic alternative to jalapeno smashed potatoes if you want something less spicy but equally comforting.
• Served with grilled chicken skewers or a crispy chicken sandwich.
• As a hearty side to a backyard burger feast.
• Topped with a dollop of sour cream, crispy bacon bits, and chives for a loaded baked potato vibe.
• Paired with a fresh, crisp green salad to balance out the rich, buttery garlic flavor.

Storage and Reheating

Let's talk about leftovers. If you somehow end up with extra potatoes, do not throw them away. They store beautifully in an airtight container in the fridge for up to four days.

The cold changes things, though.

Once chilled, the butter will solidify into a dull, white glaze over the spuds. Do not let this alarm you, as it melts back into liquid gold the second heat is applied.

To reheat, avoid the microwave at all costs because it turns the potato skins rubbery and makes the interior dry. Instead, dump them into a hot cast-iron skillet with a splash of water, cover with a lid for two minutes to steam, and then fry them uncovered for another minute to crisp the edges.

You can also toss them into an air fryer at 350°F for about five minutes to get that freshly-grilled texture back.

Ingredient Substitutes

If you don't have everything on hand, don't panic. Here are some easy swaps that work beautifully without ruining the dish:

1. Potatoes: If you don't have baby red potatoes, Yukon Gold potatoes are an excellent substitute because of their naturally buttery texture. Avoid russet potatoes as they are too starchy and can turn dry.
2. Herbs: Fresh rosemary and thyme are fantastic, but you can easily swap them for dried Italian seasoning (use 1 teaspoon total) or fresh dill and chives.
3. Garlic: If fresh garlic isn't available, use 1/2 teaspoon of garlic powder. Do not use garlic salt unless you reduce the added kosher salt.
4. Butter: For a dairy-free or vegan option, swap the butter for a high-quality vegan butter block or use all olive oil.

There is something so incredibly satisfying about peeling back a hot layer of foil to reveal perfectly tender, garlic-scented potatoes glistening in melted butter. It makes the minor burns and the smoky hair from grilling absolutely worth it. Let me know in the comments if you try these at your next cookout!