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Preheat oven to 350 degrees.
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In a large, oven-safe skillet, melt the butter and add the onions. Simmer over medium heat, stirring occasionally, for about 20 minutes, until the onions begin to turn brown and caramelize.
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While the onions caramelize, cook the egg noodles in a separate pan according to package instructions. Drain, set aside.
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Add the sour cream, cream of chicken soup, and half chicken broth. Use a silicone spatula to stir in the egg noodles. Add half of the mozzarella cheese and the chicken.
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Stir until the cheese is melted. If desired, add up to ½ cup more chicken broth.
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Top with the remaining ½ cup mozzarella cheese and bake for 10 minutes.
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Top with the crispy fried onions and bake for 5-10 more minutes, until the top is golden. Serve and enjoy!