Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Pat the chicken breast dry and season lightly with salt and pepper.
In a shallow bowl, mix the egg white. In another dish, place the panko breadcrumbs.
Dip the chicken breast into the egg white, ensuring all surfaces are coated, then press into the panko breadcrumbs to create an even, crunchy coating.
Place the coated chicken on the prepared baking sheet.
In a small bowl, combine pineapple chunks and apple cider vinegar to form a sweet and sour sauce.
Drizzle a bit of the sauce over the chicken or serve it on the side for dipping.
Toss the red bell pepper and zucchini with olive oil, salt, and pepper, then spread them on a separate baking tray.
Place both trays in the oven. Roast the vegetables for about 20 minutes and bake the chicken for 18-20 minutes or until the chicken reaches an internal temperature of 165°F (74°C), flipping halfway for even crispiness.
Once cooked, remove from the oven, slice the chicken if desired, and serve alongside the roasted vegetables with extra sweet and sour sauce for dipping.