"This deliciously cheesy mushroom casserole is wonderfully flavored with onions, thyme, and melted gruyere...."
INGREDIENTS
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1/4 cup olive oil (plus more for the pan)
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32 oz baby Bella or crimini mushrooms (sliced)
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2 teaspoons Diamond Crystal kosher salt (or 1 teaspoon of fine salt )
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1 cup onions (chopped )
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1 tablespoon fresh garlic (minced )
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1/2 teaspoon black pepper
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1/2 teaspoon dried thyme
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1 cup Gruyere cheese (shredded )
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1 teaspoon dried parsley (for garnish)