Step 1
Combine cumin chili powder oregano salt and pepper in a bowl. Sprinkle over chicken breasts on both sides.
Step 2
Turn on a multi-functional pressure cooker (such as Instant Pot®) and select Saute function. Add 1 tablespoon olive oil and sear chicken breasts 1 to 2 minutes per side working in batches so chicken sears rather than steams. Transfer chicken to a plate.
Step 3
Add garlic and onion to the hot cooker; cook and stir until browned evenly on all sides about 2 minutes. Return chicken to the pressure cooker along with lime juice chicken broth cilantro chipotle pepper with 1 tablespoon adobo sauce orange zest and juice and bay leaf. Close and lock the lid. Set timer for 8 to 10 minutes depending on size of chicken breasts.
Step 4
Meanwhile combine mayonnaise milk chipotle pepper and 1 tablespoon adobo sauce salt and garlic powder to an electric blender. Blend chipotle sauce until smooth.
Step 5
Release pressure from the cooker using the natural-release method according to manufacturer's instructions 10 to 40 minutes. Unlock and remove the lid.
Step 6
Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
Step 7
Transfer chicken breasts to a clean surface and reserve cooking liquid. Shred chicken meat using 2 forks. Place in a large bowl and drizzle 1/4 cup cooking liquid over chicken; toss to coat. Drizzle 1 tablespoon oil over the surface of a baking sheet. Add chicken to the sheet and drizzle remaining 1 tablespoon oil on top. Stir to coat evenly.
Step 8
Broil chicken in the preheated oven for 5 minutes. Toss chicken with 1 to 2 tablespoons reserved cooking liquid and rotate the pan for even broiling. Continue broiling until crispy 5 to 7 minutes more. Serve with chipotle sauce.