Gooey Macaroni and Cheese with Caramelized Onions & Mushrooms

THE NAPTIME CHEF
11Ingredients
70Minutes

Ingredients

US|METRIC
  • olive oil
  • 3 yellow onions (thinly sliced)
  • 2 cups mushrooms (Hen of the Woods, rinsed and patted dry)
  • 1 pound elbow macaroni
  • 6 tablespoons unsalted butter
  • 4 tablespoons flour
  • 2 tablespoons dry mustard
  • 3 cups whole milk
  • 6 cups shredded cheddar cheese
  • salt
  • pepper
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