Brown Butter Hasselback Potatoes with Caramelized Onions – Crispy, Buttery & Irresistible

There’s something magical about a potato that crackles with every bite — especially when it’s roasted until perfectly crispy on the outside and tender on the inside. These Brown Butter Hasselback Potatoes with Caramelized Onions are one of those dishes that look fancy but are surprisingly easy to make at home. I first made them on a cozy autumn evening when I wanted a comforting side dish that still felt special, and since then, they’ve become a go-to recipe for family dinners and gatherings.
This easy homemade Hasselback potato recipe is rich, flavorful, and unforgettable, thanks to the nutty brown butter and sweet caramelized onions. Let’s get cooking!

Ingredients

For the Hasselback Potatoes

6 medium russet or Yukon Gold potatoes
4 tablespoons unsalted butter
2 tablespoons olive oil
3 garlic cloves, minced
1 teaspoon paprika
1 teaspoon dried thyme
1 teaspoon salt
½ teaspoon black pepper

For the Caramelized Onions

2 large yellow onions, thinly sliced
2 tablespoons olive oil
1 tablespoon unsalted butter
½ teaspoon salt
½ teaspoon sugar (optional, helps caramelization)

Step-by-Step Instructions

Prepare the Potatoes

Preheat oven to 200°C (400°F).
Wash potatoes thoroughly and pat dry.
Place each potato between two wooden spoons and slice thin slits across the potato, stopping before you cut through the bottom.
Mix together 4 tablespoons melted brown butter, olive oil, garlic, paprika, thyme, salt, and pepper.
Brush the mixture generously over the potatoes, making sure to get some into the slits.

Roast the Potatoes

Place potatoes on a baking tray lined with parchment paper.
Roast for 45 minutes, then baste again with the brown butter mixture.
Roast an additional 20–30 minutes, or until crispy edges form and centers are soft.

Caramelize the Onions

Heat olive oil and butter in a skillet over medium heat.
Add sliced onions and cook slowly for 20–25 minutes, stirring occasionally.
Add salt and sugar (optional), and continue cooking until golden and jammy.

Assemble

Serve roasted Hasselback potatoes topped generously with caramelized onions.
Drizzle extra brown butter over the top for maximum flavor.

Tips & Variations

Add cheese: In the final 10 minutes of baking, sprinkle grated parmesan or mozzarella between the slits for a creamy, melty variation.
Use sweet potatoes: Swap regular potatoes for sweet potatoes for a deeper flavor and natural sweetness.
Herb upgrade: Replace thyme with rosemary or add fresh parsley before serving for a more aromatic finish.

Storing & Reheating

Refrigerator: Store leftovers in an airtight container for up to 4 days.
Freezer: Wrap cooked potatoes individually in foil, then place them in a freezer-safe bag for up to 2 months.
Reheating:
- Oven (best method): Reheat at 190°C (375°F) for 10–15 minutes until crispy again.
- Air fryer: Heat at 180°C (360°F) for 5–7 minutes.
- Microwave: Not recommended for crispiness, but fine if you’re in a hurry.

FAQs

Can I make the potatoes ahead of time?

Yes! Slice the potatoes and store them in cold water (to prevent browning) for up to 12 hours. Dry well before baking.

Do I need to peel the potatoes?

No — the skin helps the potatoes stay intact and crisp up beautifully.

Can I use red onions instead of yellow onions?

Absolutely. Red onions caramelize just as well and add a slightly deeper sweetness.

Can I make this completely dairy-free?

Yes, by replacing butter with a dairy-free alternative. The flavor will change slightly but remain delicious.

Nutritional Information (Approx. per serving)

Calories: ~290
Protein: 4 g
Carbohydrates: 38 g
Fat: 14 g

(Values vary based on potato size and toppings.)

These Brown Butter Hasselback Potatoes with Caramelized Onions are the perfect blend of elegance and comfort — a guaranteed crowd-pleaser for weeknight dinners, holiday meals, or special occasions. If you try this easy homemade Hasselback potato recipe, don’t forget to leave a comment below and let me know how it turned out!
Feel free to share it with friends, save it on Pinterest, or browse my other delicious potato and side-dish recipes for more inspiration.