Preheat your oven to 400°F.
Slice the chicken breast into strips or small pieces for quicker, even cooking.
In a shallow bowl, whisk the egg white. In another bowl, add the whole wheat breadcrumbs mixed with a pinch of salt and pepper.
Dip each chicken piece first into the egg white, then coat evenly with the breadcrumbs.
Place the chicken pieces on a lightly greased baking sheet using olive oil spray or drizzle a teaspoon of olive oil to prevent sticking.
Bake the chicken in the preheated oven for 15-18 minutes until golden and fully cooked.
While the chicken is baking, prepare the sweet & sour sauce by combining pineapple chunks, red bell pepper, low-sodium soy sauce, rice vinegar, cornstarch, and minced garlic in a small mixing bowl. Stir until the cornstarch is dissolved.
Heat a small saucepan over medium heat. Pour the sauce mixture and let it simmer for 3-4 minutes until it thickens slightly.
Meanwhile, toss the broccoli lightly with olive oil, salt, and pepper, and spread it on another baking sheet.
Roast the broccoli in the oven for about 12-15 minutes until tender and slightly crispy at the edges.
Once done, plate the crispy baked chicken, drizzle with the sweet & sour sauce, and serve alongside the roasted broccoli.