Add the Olive oil and butter to the Instant Pot, and press the Saute setting.
Melt the butter, and add the chopped onion, and saute for 5 minutes, or until golden brown.
Add the minced garlic, and saute for 1 minute.
Turn off the Saute setting, and add the frozen Cauliflower, cilantro, black beans lime juice, chicken broth, garlic salt, seasoned pepper, and lime zest, and stir well.
Place the lid on the Instant Pot until it beeps and locks.
Make sure the pressure valve is set to SEALING, press the Manual button, and set the time to 2 minutes.
It will take about 10 minutes for the Instant pot to build the pressure, and then cook for 2 minutes.
When the Instant Pot is done cooking, it will beep and go to OFF.
Do a quick release, by turning the pressure valve from sealing to VENTING, and release the pressure.
When all the pressure has been released, the float valve will drop down, and you can remove the lid to the Instant Pot.
Stir the Cauliflower, and place in a serving dish. Serve, and Enjoy!