"This comfort food just got even more comforting...."
INGREDIENTS
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8 oz dry egg noodles
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1 lb lean ground beef
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4 tablespoons (1/2 stick) butter
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1 small white onion, diced
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2 cloves garlic, minced
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8 oz baby bella mushrooms, sliced
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2 tablespoons all-purpose flour
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2 1/2 cups beef broth
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3/4 cup sour cream
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1 tablespoon Dijon mustard
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2 cups mozzarella cheese, grated and divided