Season with salt and pepper, to taste. ★ ★ ★ ★ ★ 0 Reviews Heat the oil in a large skillet over medium-high heat. Add spinach and stir for 2-3 minutes until spinach is mostly wilted. Sprinkle with Parmesan cheese, if … Heat olive oil in a large pan over medium-low heat. Add leeks and sauté for 3-4 minutes, until softened. Add garlic and sauté an additional 30 seconds. Add the leeks, thyme, ½ teaspoon salt, and ¼ teaspoon pepper and cook, stirring occasionally, until soft and beginning to brown, 10 to 12 minutes.