01 -
Set your oven to 350°F (175°C) and let it heat up.
02 -
Coat a large rimmed baking sheet (18 by 13 inches) with non-stick spray so food won't stick.
03 -
In a medium-sized bowl, whisk together soy sauce, ketchup, thawed pineapple concentrate, brown sugar, rice vinegar, cornstarch, worcestershire, garlic, ginger, and black pepper until smooth.
04 -
Spread the chunks of green and red bell peppers, red onion, and chicken on the baking sheet in a single even layer.
05 -
Drizzle the sauce all over the chicken and veggies. Toss them gently to make sure everything gets covered evenly.
06 -
Pop the sheet pan into the oven and let it bake for 10 minutes.
07 -
After the first 10 minutes, pull out the pan and stir the chicken and veggies to help them cook evenly. Add the pineapple chunks at this time, spreading them throughout.
08 -
Slide the pan back into the oven and bake for another 7-10 minutes, or until the chicken is done and has an internal temp of at least 165°F (74°C).
09 -
Take the pan out of the oven and toss everything one last time so the sauce coats nicely. Sprinkle cilantro on top if you'd like, then dish it up warm, maybe over coconut rice.