Ingredients

• 0.75 teaspoons salt
• 0.5 teaspoons ground black pepper
• 0.5 teaspoons thyme
• 2 tablespoons butter , divided
• 1 thinly sliced sweet onion
• 1.5 pounds Yukon gold potatoes , peeled and thinly sliced
• 1 cup shredded Gruyere cheese

Instructions

1. 1 Combine salt, pepper, and thyme in a bowl.
2. 2 Melt 1 tablespoon butter in a 10-inch skillet over medium heat. Cook and stir onions until soft and golden brown, about 8 minutes. Move to a bowl.
3. 3 Melt remaining 1 tablespoon butter in the skillet; remove from heat.
4. 4 Arrange 1/3 of potato slices in the skillet in a slightly overlapping layer. Sprinkle with 1/2 teaspoon of the salt mixture. Top with 1/2 of the onions and 1/2 of the Gruyere cheese. Repeat layers, ending with potatoes; sprinkle with remaining salt mixture.
5. 5 Cover and cook over medium-low heat, reducing heat to low if necessary, until potatoes are tender, about 30 minutes. Uncover and continue cooking, about 5 minutes. Run a spatula around edges to loosen; let cool, 5 to 10 minutes.
6. 6 Invert potatoes carefully onto a serving dish.

Nutrition per serving