Place the udon noodles, water, and 2 tablespoons of soy sauce in the Instant Pot®. Toss the noodles in the water to coat them, which helps prevent sticking during cooking. Close the lid.
Select Pressure Cook on High/More for 3 minutes. Once the time is up, immediately flip the valve to release the pressure. Press Cancel and remove the lid.
While the noodles are cooking, make the sauce. In a large bowl, whisk together the peanut butter, soy sauce, sesame oil, honey, chili crisp, lime juice, grated garlic, and scallions until smooth. Add salt to taste.
Pour the sauce over the noodles in the inner pot and toss to coat evenly. If the sauce is too thick, add a little water to thin it out.
Divide the noodles into bowls for serving. Top with freshly chopped cilantro, scallions, and extra chili crisp. Enjoy!