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Creamy Caramelized Onion & Mushroom Skillet Noodles

A rustic, comforting one-pan meal featuring tender egg noodles, sweet caramelized onions, earthy mushrooms, and spinach in a rich garlic parmesan cream sauce.
Print Recipe
Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 4 Servings
Course: Dinner, Main Course
Cuisine: American, Italian-American
Calories: 520
Ingredients Equipment Method Notes

Ingredients
  

Vegetables
  • 2 large yellow onions thinly sliced
  • 1 lb cremini mushrooms sliced
  • 4 cups fresh spinach
  • 4 cloves garlic minced
Pasta & Dairy
  • 12 oz egg noodles wide
  • 1 cup heavy cream
  • 2 tbsp sour cream
  • 0.5 cup parmesan cheese grated
  • 3 tbsp unsalted butter divided
  • 2 tbsp olive oil
Seasoning
  • 0.5 cup vegetable broth
  • 1 tsp red pepper flakes
  • 1 tsp dried thyme
  • 1 tsp salt plus more to taste
  • 1 tsp black pepper

Equipment

  • Cast Iron Skillet
  • Pot for boiling water
  • Knife and cutting board
  • Whisk

Method
 

  1. Bring a large pot of salted water to a boil. Cook egg noodles according to package instructions. Drain and set aside.
  2. In a large cast-iron skillet, heat 1 tbsp butter and olive oil over medium heat. Add sliced onions.
  3. Cook onions slowly, stirring occasionally, until caramelized and golden brown (approx 15-20 mins). Remove from pan.
  4. In the same skillet, increase heat to medium-high. Add remaining butter and mushrooms. Sauté until browned (6-8 mins).
  5. Add spinach to the skillet with a splash of water and cook until wilted (2 mins). Remove mushrooms and spinach from pan.
  6. Reduce heat to medium. Add minced garlic to the skillet and sauté for 30 seconds. Deglaze with vegetable broth.
  7. Whisk in heavy cream, sour cream, parmesan, thyme, salt, and pepper. Simmer for 3-4 mins until thickened.
  8. Return noodles, onions, mushrooms, and spinach to the pan. Toss to coat in sauce or arrange in quadrants for serving.
  9. Garnish generously with red pepper flakes and serve warm.

Notes

For a looser sauce, add a splash of pasta water before serving.