Preheat your oven to 425°F.
Cut the chicken breast into strips or bite-sized pieces.
In a shallow bowl, whisk the egg. In another bowl, add the panko breadcrumbs.
Dip each piece of chicken first in the egg then coat evenly with panko breadcrumbs.
Arrange the coated chicken pieces on a baking sheet lined with parchment paper.
In a small saucepan, combine pineapple chunks, rice vinegar, honey, and cornstarch. Heat over medium heat, stirring frequently until the mixture thickens into a smooth sweet and sour sauce.
Prepare the vegetables by slicing the red bell pepper, red onion, carrot, and zucchini into bite-sized pieces. Place them in a bowl, drizzle with olive oil, and season with a pinch of salt and pepper if desired.
Spread the vegetables out on a separate baking sheet.
Place both the chicken and vegetable sheets in the oven. Bake the chicken for 15-20 minutes or until cooked through and crispy, and roast the vegetables for 20-25 minutes until tender and slightly caramelized, stirring halfway through.
Once done, drizzle the warm sweet and sour sauce over the chicken or serve it on the side for dipping.
Plate the crispy chicken with a generous serving of roasted vegetables, and enjoy!