Adjust the chipotle to your taste: Two chipotle peppers plus adobo sauce gives the tinga noticeable smoky heat. Start with less if you're sensitive to spice because you can always add more.
Don't skip the natural release: Give the Instant Pot the full 10-minute natural pressure release before releasing what's left.
Blend the sauce before adding the chicken back: I think this step is worth the extra minute. Blending the tomatoes, onion, garlic and cooking liquid gives you a much smoother sauce that really coats the shredded chicken.
Shred while the chicken is warm: Chicken thighs are much easier to pull apart while they're still warm from the Instant Pot.
Thicken the sauce only if needed: If yours is thinner than you'd like after blending, use the Sauté function to simmer it briefly before returning the shredded chicken to the pot.
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