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Season the chicken breasts on both sides with taco seasoning and salt and pepper, to taste
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Optional Step: Turn your Instant pot to the Saute mode, add olive oil and saute the diced onions until softened. (Note: This step is not necessary but adds great flavor).
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If you skipped the previous step, just add the diced onions to the Instant Pot
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Lay the seasoned chicken breasts on top of the onions.
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Pour the entire can of diced tomatoes and chilies, with the liquid, into the Instant Pot (I added about 2 oz of additional water, just to make sure the can was completely cleaned out)
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Secure the lid of your Instant Pot
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Cook on high pressure for 12 minutes and do a quick pressure release when the timer beeps.
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Remove the chicken breasts and shred using 2 forks.
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Using a slotted spoon, spoon the tomatoes, onions and chilies over the chicken. Add a little extra liquid to keep the chicken moist.
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Save the shredded chicken for later, or serve immediately.
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Enjoy!