"In '300 Best Casserole Recipes' by Tiffany Collins..."
INGREDIENTS
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2 garlic cloves, minced
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2 cups shredded monterey jack cheese, divided
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1 cup ricotta cheese
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1/4 cup finely chopped fresh parsley
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1 teaspoon dried thyme
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1 lb potato, sliced (peeled or unpeeled)
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1 teaspoon salt, divided
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1 teaspoon fresh ground black pepper, divided
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1 lb cremini mushroom, sliced
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2 cups sliced onions