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French Onion Potatoes (Roasted or Grilled)

Whether you roast them or gill them, these easy French onion potatoes will make a great side dish for your next barbecue or a weeknight dinner. Naturally gluten-free.

One bowl of roasted French onion potatoes and a second bowl of grilled French onion potatoes shot from above.

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Last month I had to quickly throw together a meal for my family and on a whim tossed together these French onion potatoes.

They were such a big hit, I knew I had to share the recipe with you all! Because who doesn’t like an easy delicious potato dish?!?

The first time I made these potatoes I roasted them in the oven and served them up with these amazing hatch chile and cheese stuffed burgers (recipe coming later this summer). The next time opted to cook ’em up on the grill.

Whether you roast or grill them they are equally good and easy to prepare. Benefits of roasting them include crispier potatoes and no need to fire up the grill, while benefits of grilling include softer, moister potatoes, no oven heating up your house, and easy clean-up.

As their name suggests the seasoning for these potatoes is inspired by French onion soup. They are a little bit salty, buttery, plenty onion-y, and slightly beefy with hints of thyme. They could easily be paired with all sorts of meat dishes, including burgers, hot dogs, steaks, chicken, pork roast, etc.

Ingredients (+ notes & substitutions)

Large bowl of cubed potatoes, a small bowl of spices, small bowl of dried onion flakes, and tray with butter and bouillon cube.
  • Butter: Could sub for olive oil for dairy-free.
  • Beef bouillon cube: BOU bouillon cubes are the best in my opinion. They are non GMO, natural, and gluten-free. If you are avoiding gluten, make sure you choose bouillon cubes that do not contain gluten; many brands sneak it in. See my product recommendations below for more information about BOU bouillon cubes.
  • Dried onion flakes
  • Onion powder: Double the onion, double the fun.
  • Garlic powder
  • Dried thyme
  • Salt and pepper
  • Yukon gold potatoes: Alternately you could use Russet potatoes.

How to make French onion potatoes (+ tips)

You have two options here for cooking the potatoes. You may either roast them or cook them in a foil packet on the grill.

Begin by heating your oven or grill to 400 degrees.

In a large bowl, combine the melted butter, bouillon cube, dried onion flakes, and spices.

Melted butter, dried onion flakes, and spices mixed together in a clear glass bowl shot from above.

Add the potatoes and toss to coat.

To roast:

Arrange the potatoes on a large baking sheet lined with parchment paper or tin foil.

Cubed potatoes in French onion butter sauce on baking sheet.

Bake for 40 minutes, flipping the potatoes at the midway point (20 minutes), until potatoes are browned and crispy.

Roasted French onion potatoes on a baking sheet sprinkled with fresh thyme shot from above.

To grill:

Transfer the potatoes to a large sheet of tinfoil.

Cubed potatoes coated in French onion butter sauce on a piece of tinfoil.

Fold it closed to create a packet and grill for 30-minutes or until potatoes are fork-tender.

Grilled French onion potatoes in tinfoil.


Refrigerate in an airtight container for up to five days.

A white bowl filled with roasted French onion potatoes with sprig of thyme shot from above.
A white bowl filled with grilled French onion potatoes with sprigs of fresh thyme shot from above.

More roast vegetable dishes you may enjoy:

  • Smashed Rosemary Garlic Roasted Radishes: A great alternative to smashed potatoes, these smashed rosemary garlic roasted radishes are just as tasty but lower in both carbs and calories. This side dish requires only a handful of ingredients and is simple to prepare. Naturally gluten-free, vegetarian, and vegan adaptable.
  • Roasted Truffle Asparagus: Elevated with the addition of black truffle oil and salt, this truffle asparagus is roasted to perfection. This simple side dish is perfect for special occasions and takes just 15-minutes to prepare with only four ingredientsNaturally gluten-free and vegan.
  • Honey Sriracha Brussels Sprouts: These sweet and spicy roasted honey sriracha Brussels sprouts are so incredibly tasty and addictive. This quick and simple 5-ingredient side dish pairs great with proteins including fish, shrimp, and chicken. Naturally vegetarian and gluten-free.
  • Honey Garlic Ginger Roasted Carrots: These honey garlic ginger roasted carrots require minimal effort while delivering maximum flavor. This simple, hands-off side dish is healthy, gluten-free, and vegetarian-friendly.

If you make these French onion potatoes I’d love your feedback. Please leave a comment and/or a rating below as I greatly value your opinion. Or snap a pic and tag me on Instagram @taoofspiceblog. Love, light, and happy cooking ya’ll ♥

One bowl of roasted French onion potatoes and a second bowl of grilled French onion potatoes shot from above.

French Onion Potatoes

Yield: 5 cups
Prep Time: 5 minutes
Cook Time: 40 minutes
Total Time: 45 minutes

These easy, versatile, and flavorful French onion seasoned potatoes can be roasted or grilled making them a great gluten-free side dish for your next barbecue or a weeknight dinner.


  • 1/4 cup butter, melted
  • 1 beef bouillon cube 
  • 2 tablespoons dried onions flakes
  • 1 tablespoon onion powder
  • 1 teaspoon garlic powder
  • 1 teaspoon dried thyme
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper 
  • 2 pounds Yukon gold potatoes, cut into 1/2-inch cubes



  1. Preheat oven to 400 degrees.
  2. Line a large baking sheet with parchment paper or foil.
  3. In a large bowl, whisk together the butter, onion flakes, and spices.
  4. Add the potatoes and toss to coat.
  5. Transfer the potatoes to the baking sheet and arrange in a single layer.
  6. Bake for 40 minutes, tossing after 20. Serve warm.


  1. Heat grill to 400 degrees.
  2. In a large bowl, whisk together the butter, onion flakes, and spices.
  3. Add the potatoes and toss to coat.
  4. Transfer potatoes to a sheet of tinfoil and fold into a packet.
  5. Grill for 30 minutes or until potatoes are fork-tender. Serve warm.

Storage: Refrigerate in an airtight container for up to five days.

Nutrition Information:
Yield: 5 Serving Size: 1 cup
Amount Per Serving: Calories: 265Total Fat: 10gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 3gCholesterol: 24mgSodium: 492mgCarbohydrates: 42gFiber: 5gSugar: 3gProtein: 5g

The nutritional information provided is computer generated. It is only an estimate and intended for informational purposes only. Nutrition details may vary depending on various factors such as origin, freshness of ingredients, etc

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