Start by putting the pressure cooker on the saute function and brown the ground beef. (Instant Pot or Ninja Foodi)
If you are using taco seasoning, add it in at this point following the package instructions. (NOTE - If you do not use seasoning, add in 1/2 tsp onion powder and 1/2 tsp garlic salt into the meat for flavoring.) It works best to use lean ground beef, so you do not have to drain it, but if you need to, drain the meat and return to the pot.
Hit off on the Ninja Foodi or cancel on the Instant Pot to turn it off.
Once the meat is done cooking, add in the pasta, water, tomatoes, and chilies. Make sure the pasta is fully under the water as much as possible.
Secure the pressure cooker lid and set the nozzle to 'seal'.
Cook on manual high pressure for 6 minutes.
Quick-release the pressure, immediately after the 6 minutes, move the nozzle to vent and release the steam.
Open the lid and stir in the cheese, 1 cup at a time. Add a cup, stir and then add another. (Be sure to do 1 cup at a time and stir in between)
Stir in the butter, milk, and sour cream until all is mixed well.
Serve in a dish topped with toppings of your choice.
It's best to either use taco seasoning to give it more spice if that's what you prefer or if not, add in 1/2 tsp onion powder and 1/2 tsp garlic salt into the meat when you are cooking it to add flavor.Lean beef is the best option so that you do not have to drain it. The beef broth will give it more flavor as well as opposed to water.