Hit SAUTE on 6 quart Instant Pot.
Once it reads HOT, add in beef and onion.
Cook, breaking up the meat as you go, until the beef is no longer pink.
Hit CANCEL on the Instant Pot and drain grease.
Replace the pot, then stir in broth and milk, scraping up any brown bits on the bottom to avoid a BURN notice.
Stir in ketchup, dijon, garlic powder, paprika, salt, pepper, green bell pepper, and uncooked macaroni. Be sure everything is fully incorporated and the macaroni is submerged in the liquid.
Cover and lock the lid (make sure the steam releasing handle is pointing to sealing).
Cook on HIGH pressure for 4 minutes.
Flip the valve to "venting" for a quick release, hit CANCEL on the Instant Pot, then stir in sour cream and cheese.
Taste and re-season, if necessary, then serve and enjoy!
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