Hit Sauté on the Instant Pot, and when it reads Hot, add the oil. Then add chicken, and season with dried onions, sea salt, garlic powder, Italian seasoning, paprika and pepper, and cook until no longer pink, stirring frequently
Hit Cancel, make sure no meat is stuck to bottom of pot, and layer spaghetti noodles in criss cross pattern over chicken
Pour chicken broth over noodles, press down with spatula to cover with liquid, and add diced tomatoes over pasta. Do not stir! Place lid on pot, make sure valve is on sealing position, and cook for 4 minutes. Pot will take a few minutes to pressurize. When pot beeps, do quick release or gradual release, then wait for pin to drop and open lid carefully
Stir well, then pour in heavy cream, and gradually add 1 cup of cheese at a time, stirring until fully blended. Add bacon pieces if desired, and allow to sit and absorb some of the liquid before serving.