INGREDIENTS
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1 (10-3/4-ounce) can condensed cream of mushroom soup, divided
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1 pound ground beef
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1/3 cup dry bread crumbs
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1/2 cup finely chopped onion
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1 egg, beaten
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2 teaspoons chopped fresh parsley, plus extra for garnish (optional)
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1 teaspoon garlic powder
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1/2 teaspoon black pepper
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1/4 cup milk
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1 1/2 cups sliced fresh mushrooms