Add water into inner pot of the Instant Pot, followed by the ground beef.
Set Instant Pot to manual high pressure, for 10 minutes.
Once the time is up, do a quick pressure release.
Remove the lid and set Instant Pot to its saute function.
Add onion, garlic, garlic powder, cayenne and cumin. Stir all ingredients together.
Add cornstarch and incorporate into meat mixture. Allow to simmer for 5-6 minutes.
Serve in taco shells with your favorite taco toppings. Enjoy!