Preheat the oven to 350°F and spray a 9×13 baking dish with nonstick cooking spray.
Cook the spaghetti according to package directions until al dente. Drain and set aside.
In the same pot, combine cream of chicken soups, ROTEL, sour cream, chicken broth, 1 cup of shredded cheese, garlic powder, onion powder, salt, black pepper, and crushed red pepper flakes. Stir until smooth.
Fold in the cooked spaghetti and shredded rotisserie chicken until well coated.
Transfer the mixture to the prepared baking dish and spread evenly.
Sprinkle the remaining 1 cup of shredded cheese over the top. Cover with nonstick aluminum foil.
Bake for about 20 minutes until hot and bubbly, then remove the foil and bake for an additional 5-10 minutes until the cheese is melted and slightly golden.
Garnish with fresh chopped parsley before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.