Add Pot Mixture ingredients to the Instant Pot and stir to combine. Secure the lid, making sure the vent is closed.
Using the display panel select the MANUAL or PRESSURE COOK function*. Use the +/- buttons and program the Instant Pot for 25 minutes.
When the time is up, quick-release the remaining pressure. Run the lid under cold water and set aside. This will help the Instant Pot to come to pressure more quickly in the next step.
Add the sliced sausage and stir to combine. Secure the lid, making sure the vent is closed.
Using the display panel select the MANUAL or PRESSURE COOK function*. Use the +/- buttons and program the Instant Pot for 15 minutes.
When the time is up, let the pressure naturally release until the pin drops (typically 20-25 minutes).
Remove the lid, then using the display panel select the SAUTE function. Add butter. Cook and and stir until incorporated and slightly thickened.
Use a potato masher or immersion blender to break up some of the beans to achieve desired consistency, keeping in mind the mixture will continue to thicken as it cools.