Ingredients

• ▢¼ cup olive oil plus more for the pan
• ▢32 oz baby Bella or crimini mushrooms sliced
• ▢2 teaspoons Diamond Crystal kosher salt or 1 teaspoon of fine salt
• ▢1 cup onions chopped
• ▢1 tablespoon fresh garlic minced
• ▢½ teaspoon black pepper
• ▢½ teaspoon dried thyme
• ▢1 cup Gruyere cheese shredded
• ▢1 teaspoon dried parsley for garnish

Instructions

• Preheat your oven to 400 degrees F. Grease a 2-quart baking dish with olive oil.
• Heat the olive oil in a large, deep skillet over medium-high heat. Add the mushrooms, onions, and kosher salt. Cook, stirring occasionally, until the mushrooms have released their liquid and the liquids have mostly evaporated, about 10 minutes.
• Add the garlic, black pepper, and thyme. Cook, stirring, for one more minute. Remove from heat.
• Transfer the mixture to the prepared baking dish. Sprinkle it with the shredded cheese.
• Bake the casserole until hot and bubbly, about 15 minutes. Sprinkle with parsley and serve.