Go Back
+ servings
Caramelized Onion Spaghetti Squash | squash filled with onions, mushrooms and kale for a healthy, vegetarian meal | thealmondeater.com
Print Recipe
4.78 from 40 votes

Caramelized Onion Spaghetti Squash

Onions sautéed with butter and olive oil create this scrumptious Caramelized Onion Spaghetti Squash recipe, complete with mushrooms!
Prep Time10 mins
Cook Time25 mins
Total Time35 mins
Course: dinner
Cuisine: American
Diet: Gluten Free, Vegetarian
Keyword: baked spaghetti squash
Servings: 2
Calories: 628kcal
Author: Erin


  • 1 2-3 lb. spaghetti squash
  • ¼ cup olive oil
  • 2 tablespoon butter I used dairy free
  • 2 medium yellow onions peeled and sliced into longer strips if possible
  • 1 ½ cup mushrooms
  • 1 cup kale
  • ¼ teaspoon rosemary I used fresh, but dried would work too
  • Salt and pepper to taste
  • Optional: sprinkle of parmesan cheese


  • Preheat oven to 350°.
  • Slice squash in half, remove seeds and place on baking sheet.
  • Brush 2 tablespoon olive oil on both sides of the squash (1 tablespoon per half) and then place face down in the oven.
  • While squash is roasting, melt butter and last 2 tablespoon oil over medium-high in a large skillet.
  • Add onions to skillet, stirring occasionally. After 5 minutes, add mushrooms.
  • After approximately 10 minutes, the onions should start to caramelize. If they look like they're burning at all, add an extra tablespoon of oil.
  • Add kale to skillet and continue to stir everything together until onions turn a nice golden brown color.
  • After 45 minutes, remove squash from oven and allow 10 or so minutes for it to cool off.
  • Once slightly cooler, use a fork to remove "spaghetti" from squash and place in a skillet; add rosemary, salt and pepper and stir everything together.
  • Add parmesan cheese if you wish and enjoy!


*Calories are an estimation and are per serving


Calories: 628kcal | Carbohydrates: 63g | Protein: 9g | Fat: 43g | Saturated Fat: 12g | Cholesterol: 31mg | Sodium: 238mg | Potassium: 1289mg | Fiber: 13g | Sugar: 25g | Vitamin A: 4518IU | Vitamin C: 64mg | Calcium: 232mg | Iron: 3mg