French Onion Potatoes Bake (Printable)

Golden potato slices layered with caramelized onions and melted Gruyère cheese for a flavorful side.

# What You'll Need:

→ Potatoes

01 - 4 large Yukon Gold potatoes, scrubbed and sliced into ½-inch rounds
02 - 2 tbsp olive oil
03 - ½ tsp kosher salt
04 - ¼ tsp black pepper

→ Caramelized Onions

05 - 2 large yellow onions, thinly sliced
06 - 2 tbsp unsalted butter
07 - 1 tbsp olive oil
08 - ½ tsp sugar
09 - ¼ tsp salt
10 - 1 tsp fresh thyme leaves or ½ tsp dried thyme

→ Topping

11 - 1 cup (3.5 oz) grated Gruyère cheese
12 - 2 tbsp fresh parsley, chopped (optional)

# Directions:

01 - Set oven to 425°F. Line a baking sheet with parchment paper.
02 - Toss sliced potatoes with olive oil, kosher salt, and black pepper. Arrange in a single layer on the baking sheet. Roast for 25–30 minutes, flipping halfway, until golden and tender.
03 - In a large skillet over medium-low heat, melt butter with olive oil. Add sliced onions and salt. Cook, stirring regularly, until softened, about 10 minutes. Add sugar and thyme, continue cooking, stirring occasionally, until onions are deeply caramelized and golden, about 20–25 more minutes. Adjust heat to avoid burning.
04 - Remove roasted potatoes from oven and arrange in a shallow baking dish or ovenproof skillet in slightly overlapping layers.
05 - Evenly spread caramelized onions over potato slices, then sprinkle grated Gruyère on top.
06 - Return to oven and bake 10–12 minutes until cheese melts and bubbles. Optionally, broil for 2–3 minutes to brown cheese further.
07 - Sprinkle with chopped parsley and serve immediately while hot.

# Expert Tips:

01 -
  • Golden, creamy layers that taste like French onion soup but feel fancy enough for company.
  • The caramelized onions do most of the heavy lifting while your potatoes roast—minimal hands-on time despite the deep flavor.
  • Naturally gluten-free and vegetarian, yet nobody at the table will notice because they're too busy reaching for seconds.
02 -
  • The onions need time and low heat—rushing them on high heat gives you burned onions instead of caramelized ones, and there's no fix for that.
  • Slice your potatoes and onions uniformly so everything cooks at the same rate; one thick potato slice will still be raw while its neighbors are perfect.
  • Don't skip the halfway flip on the potatoes; it's the difference between golden and pale.
03 -
  • Make the caramelized onions a day ahead and store them in the fridge—they actually deepen in flavor overnight and save you time.
  • Use a mandoline if you have one for perfectly even potato slices that cook uniformly, but watch your fingers.
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