place trivet in the bottom of the Instant Pot
place chuck roast on the trivet
add sliced or chopped onions to the Instant Pot on top of the chuck roast
dump entire can of pineapple chunks and the juice on top of the onions and chuck roast
add all of your seasonings. (If your chuck roast is on the larger size, be sure to adjust your seasonings to add enough flavor! Don't be afraid to have a heavy hand here!)
add 1 or 2 cans of chipotle peppers in adobo sauce to the instant pot. Depending on the level of spice you are comfortable with will determine if you use 1 or 2 cans. You can also dump both cans in and then remove the large peppers before blending so you get all of the flavor with less spice!
place the lid on your instant pot
pressure cook on high for 45 minutes to 1 hour depending on the size of your chuck roast. Of course, a larger one more than 5 pounds may need more time, maybe closer to 90 minutes.
allow Instant Pot to naturally release for 5-10 minutes
remove chuck roast and set aside to cool for a few minutes before shredding
while chuck roast is cooling, blend the sauce in a food processor, blender, or in the Instant Pot with an immersion blender. However, if you'd like to cut some of the spice, you can remove the larger chipotle peppers before blending.
this recipe makes a lot of sauce. Basically enough for 2 chuck roasts, so reserve about half before adding the meat back into it so the chuck roast isn't swimming in sauce. You can always add in more sauce.
shred the chuck roast and add back into the Instant Pot with the sauce
mix well to incorporate all of the chuck roast and sauce together
serve over rice, veggies, or on a roll. Enjoy!