01 -
Place sliced potatoes in a large pot of cold, lightly salted water. Bring to a boil, then reduce heat and simmer for 5 to 7 minutes until just tender. Drain and let cool slightly.
02 -
In a heavy skillet, melt 2 tablespoons of butter with 1 tablespoon olive oil over medium-low heat. Add onions and cook, stirring occasionally, for 15 to 20 minutes until golden brown. Season with salt, transfer to a plate, and set aside.
03 -
In the same skillet, heat remaining butter and oil over medium heat. Add par-cooked potato slices in a single layer. Season with salt, black pepper, and fresh thyme. Cook for 5 to 7 minutes per side, flipping gently, until golden and slightly crispy.
04 -
Transfer potatoes to a plate as they finish cooking. Return all potatoes to the skillet with the caramelized onions. Toss gently to combine, adding a splash of stock if desired. Adjust seasoning to taste.
05 -
Sprinkle with chopped fresh parsley and serve immediately as a side dish.