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Place sausage in a large, deep skillet. Cook over medium-high heat until evenly brown. Drain, and set aside. Melt butter in skillet, and cook and stir the green onions and mushrooms until tender.
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In a large bowl, mix the eggs, cottage cheese, Monterey Jack cheese, and chiles. Stir in the sausage, green onions, and mushrooms. Cover, and refrigerate overnight.
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Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9x13 inch baking dish.
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Pour into the prepared baking dish.
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Bake 40 to 50 minutes in the preheated oven, or until lightly brown. Let stand 10 minutes before serving.