Combine soy sauce, brown sugar, and garlic in a small bowl. Set aside.
Pour the oil into the Instant Pot and press the Sauté button. Once the oil is hot, add the pork butt and sear until browned on all sides. Turn off the Instant Pot.
Add the soy sauce mixture and chipotle peppers to the Instant Pot and pressure cook on high for 60 minutes. Release naturally and pull the pork apart with two forks.
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Recipe Tips
To prepare this recipe in a slow cooker, sear the pork butt in a skillet over medium heat before placing it in the slow cooker with the soy sauce mixture and chipotle peppers. Cook on low until the meat flakes easily when pricked with a fork, about 6 hours. Pull the pork apart with two forks.