Season the chicken generously with salt and pepper
Heat the remaining 1 TBSP oil and sauté the onions until soft-about 5 minutes
Stir in the pureed sauce.
Add chicken to pot
Cook under high pressure for 25 minutes. Quick release pressure. When pressure is reduced remove the chicken to cutting board.
Let chicken cool slightly and then shred. Set aside.
Strain sauce through medium sieve. Return sauce to the pressure cooker pot and bring to a simmer.
Add red peppers and cook until tender-about 10 to 15 minutes.
Return shredded chicken to pot and add cilantro.
Season with salt and pepper.
Serve with rice pilaf.