Empty bottle of barbecue sauce into your Crock Pot Express pressure cooker.
Cut your chicken breasts in half and put on bbq sauce.
Add 1/2 c. water into your barbecue sauce bottle, cover, shake, and empty into your pressure cooker.
Empty your can of pineapple chunks, with juice/small can at store, into your pot. Add sliced onion too if desired.
Stir gently just so chicken is coated with sauce.
Set Crock Pot Express to poultry setting for 12 minutes.
Quick release and if making tacos shred chicken in the pot, then add to small flour tortillas with cheese and fixings and enjoy.