Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Slice the chicken breast into thin strips or bite-sized pieces for even cooking.
In a small bowl, whisk the egg white. In another bowl, place the panko bread crumbs.
Dip each piece of chicken into the egg white, then coat evenly with panko bread crumbs.
Place the breaded chicken pieces onto the prepared baking sheet and spray lightly with olive oil.
Bake for 15-20 minutes or until the chicken is cooked through and the coating is crisp, flipping halfway through.
While the chicken bakes, prepare the sweet and sour sauce. In a small saucepan over medium heat, combine pineapple chunks, red bell pepper, rice vinegar, honey, and soy sauce.
Bring the sauce to a gentle simmer and cook for about 5 minutes until the flavors meld and the pieces soften slightly.
Once the chicken is done, drizzle or toss it with the warm sweet and sour sauce, ensuring each piece is nicely coated.
Serve immediately and enjoy your bright, crispy, and tangy sweet and sour chicken dish.