*OPTIONAL: For best results, place the steak into the freezer for 30 minutes. This makes thinly slicing the steak easier.
Preheat the Instant Pot to Saute.
Slice the steak into thin strips and season with garlic, salt, and pepper.
Add two tablespoons of the butter to the hot Instant Pot. Add the steak, onion, and peppers and saute, stirring occasionally for 5 minutes.
Turn the Instant Pot off. Pour the beef broth into the bottom of the pot and use a wooden spoon to deglaze the bottom of the pot.
Place the lid on the pot and set to sealing. Cook on manual/high for 6 minutes.
Allow the pot to come to pressure naturally for 10 minutes before removing the lid.