Preheat the oven to 400 degrees. Spray a sheet pan with cooking spray.
Sprinkle the chicken with salt and pepper. Place on the sheet pan and bake for 20 minutes.
Meanwhile, combine all of the sauce ingredients except for the cornstarch and water in a medium saucepan over medium high heat. Cook for 5 minutes.
Combine the cornstarch and water and mix well. Add to the sauce, whisking continuously, and bring to a boil. Boil for 2-3 minutes or until sauce has thickened.
Remove the chicken from the oven and add all of the veggies and pineapple to the sheet pan.
Cover the chicken and veggies with ¾ of the sauce. Bake for 15 minutes.
Remove from the oven and cover with remaining sauce.
Serve with rice, noodles, or quinoa.