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Easy Mushroom Spaghetti

  • Author: Jo & Bart
  • Total Time: 25 Minutes
  • Yield: 2 1x
  • Diet: Vegetarian


Simply toss sweet, caramelized onions and mushrooms with al dente spaghetti and enjoy a satisfying meal that's perfect for any occasion.



1 large yellow onion

30g butter

220g spaghetti

220g button mushrooms

1 tbsp miso paste

30g grated parmesan

1/2 cup pasta water

chopped parsley for topping

chili flakes (optional)

Salt to taste


  1. Cut the onion into thin strips. Cook it in a pan with the butter over medium to medium low heat for about 30 minutes, stirring frequently. At this point, the onion should be caramelized. If not, don't worry, let it cook a little more. Don't hesitate to add a little water from time to time to prevent the onion from sticking.
  2. Meanwhile, cook the spaghetti in boiling salted water. Keep 1/2 cup of pasta cooking water, then drain and set aside.
  3. In the same pan as for the onions, add a little butter if necessary and cook the mushrooms (cut into strips) over medium to high heat until they are slightly browned.
  4. Add the caramelized onions, miso paste, spaghetti, parmesan and 1/4 cup pasta water to the pan with the mushrooms. Stir constantly until the sauce is creamy and evenly coats the pasta. Adjust the amount of pasta water as needed to achieve a smooth and silky texture.
  5. Garnish with basil, parsley, and chili flakes (optional). Serve hot and enjoy!


  • Since miso and parmesan are already salted, be careful how much salt you add to the recipe.
  • Take your time to caramelize the onions. The cooking process should be slow and gentle to allow the onions to become golden brown and sweet.
  • Prep Time: 10 Minutes
  • Cook Time: 15 Minutes
  • Category: Pasta
  • Method: Pan
  • Cuisine: European

Keywords: mushroom, spaghetti, mushroom Spaghetti, mushroom pasta