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Place cavatappi noodles into the cooker (cavatappi is recomended but if you prefer a different type feel free to venture out, it will turn out just as good). Add chicken broth, heavy whipping cream, cream cheese and onion powder; mix and stir.
Place the lid on. Pressure cook on high for 3 minutes and 5 minutes natural release. Follow the manfacture instructions for a quick release. Remove the lid. Mix well until the cream cheese completely covers the noodles.
Add buffalo sauce and the rest of the cheese (in 4-5 increments to prevent clumping); stir until cheese is fully melted and well mixed. Season with 1 tsp salt (+/- adjust to your liking) and ¼ tsp black pepper; mix and stir.