Pour olive oil evenly over the bottom of a 6 Quart Instant Pot pressure cooker.
Place chicken tenders in pot in one even layer.
Sprinkle meat with salt and taco seasoning.
Pour canned tomatoes and green chilies on top of the chicken.
Pour macaroni pasta into pot in an even layer. DON'T stir.
Gently pour chicken stock over the pasta. DON'T stir.
Make sure the pasta is submerged in the liquid. Gently press pasta under the liquid, if necessary.
Cover with lid and lock it. Switch steam valve to the SEAL position. Select the PRESSURE COOK/MANUAL setting and set the cooking time for 4 minutes at HIGH PRESSURE. Press start. (See Note 1)
When cooking is complete, use a QUICK RELEASE to instantly de-pressurize the pot.
Use tongs to take the chicken tenders out of the pot while mixing the remaining ingredients. Place meat on a cutting board.
Cut meat into bite-sized pieces, then place it back in the pot.
Add grated cheese and stir all ingredients together.
Ensure pressure cooker is OFF. Replace lid and let stand for 10 minutes. The cheese will melt and any remaining liquid will be absorbed.
Serve hot. Top with fresh cilantro or parsley, if desired
Notes
If you are camped at an elevation above 2,000 feet MSL (mean sea level) you may need to adjust your cooking time to compensate for the thinner air. Increase cooking time by 5 percent for every 1,000 feet above 2,000 feet of elevation.