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Balsamic caramelized onions and flavorful mushrooms are a winning combo in this creamy, insanely cheesy mac 'n' cheese! Perfect weeknight comfort food.
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5 from 6 votes

Balsamic Caramelized Onion Mushroom Mac 'n' Cheese

Balsamic caramelized onions and flavorful mushrooms are a winning combo in this creamy, insanely cheesy mac 'n' cheese! Perfect weeknight comfort food.
Prep Time 20 minutes
Cook Time 20 minutes
Total Time 40 minutes
Servings 6 servings

Ingredients

  • 1 tablespoon olive oil
  • 1/4 cup plus 1 tablespoon, divided butter
  • 1 medium onion, thinly sliced
  • 1 cup thinly sliced button mushrooms
  • 2 cloves garlic, minced
  • 1/4 cup balsamic vinegar
  • 1/4 cup white whole wheat flour
  • 1/2 cup half and half cream
  • 1-1/2 cups milk
  • 1 cup shredded sharp cheddar cheese
  • 1/3 cup grated Parmesan cheese
  • 12 oz elbow pasta, cooked according to package instructions
  • Salt and pepper to taste

Instructions

  • In a large oven-safe skillet over medium heat, melt olive oil and 1 tablespoon butter until pan is shimmery. Add onions and let cook, stirring occasionally until onions are a deep caramelized color, about 15-20 minutes.
  • Add mushrooms to pan and saute an additional 3-4 minutes or until mushrooms are softened. Add garlic and balsamic and saute 1 minute until fragrant. Scrape onion/mushroom mixture into a bowl and set aside.
  • In same skillet over medium heat, melt remaining 1/4 cup butter. Whisk in flour until completely smooth and let cook 1 minute until golden brown. Slowly whisk in half and half and milk until mixture is smooth. Bring to a simmer over medium heat until sauce is bubbly and thickened.
  • Remove sauce from heat and whisk in cheeses until melted. Add cooked pasta and onion/mushroom mixture and stir until evenly combined. Season with salt and pepper to taste.
  • Bake mac 'n' cheese in oven-safe skillet or a greased 9x13 baking dish at 375F 15-20 minutes or until bubbly and golden brown. Serve hot and enjoy!

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