Set the Instant Pot on SAUTE & keep it at NORMAL. Add 2.5 tbsp oil & when the oil becomes moderately hot add the flash marinated chicken and saute until they become lightly golden around the edges. The chicken should be well cooked by now. Set them aside.
In the same pot add more 2.5 tbsp oil and gently release the garlic and the onions. Saute for 1 min. CANCEL the SAUTE function.
Add the liquid (either water or chicken broth) to the pot and de-glaze very well scraping the sides and the bottom of the pot very well with the help of a spatula. This is to avoid the BURN error.
Add the rice linguine noodles in a zig zag or bird nest pattern (watch the recipe video ABOVE, it's so helpful). DO NOT add the noodles all at once. Gently press down the noodles with the spatula so that they get a nice coat of water. This is IMPORTANT.
Now, layer the bell peppers on top of the noodles (for crisp tender veggies **read NOTES below). Close the lid of the Instant Pot and SEAL the valve. PRESSURE COOK on HIGH for 2 minutes for al dente noodles. **Read NOTES below for softer noodles.
Once, the cooking cycle is over the Instant Pot will begin to beep. Wait for Natural Pressure Release for 3 mins and than release the rest of the pressure manually by moving the valve from the SEALING to the VENTING position.
Carefully open the lid of the pot. You will have a little amount of liquid left. Don't worry the noodles will suck up all that liquid while de-tangling them.
With the help of two forks gently den-tangle the noodles (refer the recipe Video ABOVE). You'll need a little more time and patience to de-tangle gluten free rice noodles as compared to regular wheat noodles.
Now, hit the SAUTE function and set it on LOW.
Add all the sauce ingredients mentioned above in the "For the Sauce" section above. Also, add red pepper flakes (for extra spicy read notes below). Gently toss the noodles in the sauces over low heat until the noodle strands are well coated with the sauce.
Add back the sauteed chicken and mix well with the drunken noodles.
Finally, CANCEL the SAUTE function and add the fresh Basil leaves and the scallions. Mix them with the noodles and serve hot!