The night before, rinse 2 cups dried Pinto beans in a large bowl, drain
Add fresh water until they cover the beans by 2 inches
Let sit on the counter overnight
The next day, drain the water from the beans and set aside.
Plug Instant Pot in and select Sauté and + until the light is on More for high heat
Wait for the display to say Hot
Once hot, add 1 tablespoon avocado oil, 1 cup white onion, 1 Serrano pepper, 1/2 cup cilantro stems, and 2 teaspoon ground cumin
Sauté for 7 minutes until onions begin to soften
Press Cancel
Add beans, 2 cups homemade chicken stock, and 2 teaspoon salt and stir
Secure the Instant Pot lid and set the pressure gauge on Sealing
Press Manual high heat and set the timer to 11 minutes
Once the timer is done, unplug the Instant Pot and let it come down from pressure naturally by waiting for the pressure gauge to fall without releasing the pressure
Remove the lid and blend using an immersion blender to make smooth, creamy refried beans. If the beans seem too runny to you, allow them to sit and steam off any excess moisture. Run the immersion blender again until you get the right consistency.
If you do not have an immersion blender (you really should get one), you can also blend the beans in a blender or food processor
Put the refried beans into a bowl and serve