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speckled white plate of roasted leeks

Oven Roasted Melted Leeks with Parmesan Cheese

  • Author: Alex Aldeborgh, RD
  • Prep Time: 5 minutes
  • Cook Time: 30 minutes
  • Total Time: 35 minutes
  • Yield: serves 4
  • Category: side dish
  • Method: oven
  • Cuisine: American
  • Diet: Vegetarian


Roasting leeks in the oven yields a luscious, melt-in-your-mouth texture and caramelized flavor you’re going to love. You need just a handful of ingredients to make this roasted melted leeks recipe – leeks, olive oil, salt, pepper, thyme, and parmesan cheese. Serve roasted leeks as a side dish with dinner, or on top of toast.


  • 34 small leeks
  • 1/2 cup shredded parmesan cheese
  • 1/2 tsp dried thyme
  • 3 tbsp olive oil
  • 1/4 tsp salt
  • 1/4 tsp pepper
  • 1/4 cup parsley, finely chopped – optional for garnish


  1. Preheat oven to 425°F.
  2. Cut off the dark green leaves of the leeks and discard. Then cut the leeks in half widthwise so each piece is 3-4 inches long. Cut the leeks in half lengthwise.
    wooden cutting board with sliced leeks and a knife
  3. Clean the leeks by fanning them out and running them under cold water to remove dirt and debris (see notes for more details). Pat them dry.
  4. In a 7×10 ceramic or glass baking dish, drizzle the olive oil. Then sprinkle in half of the parmesan cheese, half of the dried thyme,  and half of the salt and pepper. 
    Olive oil, shredded cheese, and dried herbs in a white ceramic baking dish
  5. Place the leeks cut side down in the pan, all in a row next to each other but not overlapping.
    sliced leeks in a white ceramic baking dish
  6. Drizzle with a touch more olive oil and the other half of the parmesan cheese and dry seasonings.
    sliced leeks in a white ceramic baking dish
  7. Cook in the oven for 25-30 minutes, until leeks are super soft and “melted” and edges are deeply golden brown and caramelized. 
    roasted leeks in a white ceramic baking dish


How to clean leeks

Leeks, like onions, are made up of lots of layers. Leeks grow submerged in the soil, so as they grow, they collect dirt and sand in between their layers.

Because they are so dirty, it is crucial to properly clean leeks before cooking and eating them.

To clean leeks for this recipe, start by cutting the leeks in half lengthwise. then, run each half under cold water in your sink, fanning out the layers so any dirt and sand run out with the water.

Pat the leeks dry with a clean dish towel and they’re ready to use!

Keywords: roasted leeks, roasting leeks, melted leeks