2 (10 ounce) packages fresh spinach, rinsed and stems removed
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1 teaspoon salt
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4 tablespoons butter, melted
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0.25 cup finely chopped onion
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1.5 cups shredded Cheddar cheese, divided
Instructions
Preheat oven to 350 degrees F (175 degrees C). Grease a 2 quart casserole dish.
Melt 2 tablespoons butter in a large skillet over medium heat. Saute mushrooms until tender, about 8 to 10 minutes.
Meanwhile, place spinach in a large pot. Wilt over medium heat; drain, squeezing or pressing out excess water. Place in prepared baking dish and top with salt, 4 tablespoons melted butter, onion and 1/2 of the cheese. Layer mushrooms on top and sprinkle with remaining cheese.