Preheat your oven to 400°F.
In a shallow bowl, whisk together the egg white. Place the whole wheat flour in a separate dish.
Lightly coat the chicken breast with the flour, then dip into the egg white to ensure an even, thin coating.
Place the coated chicken on a baking sheet lined with parchment paper and lightly spray with olive oil.
Bake the chicken for 20-25 minutes or until fully cooked and the coating is crispy.
While the chicken is baking, combine pineapple chunks, reduced-sodium soy sauce, rice vinegar, honey, and tomato ketchup in a small bowl to form the sweet and sour sauce.
Toss the red bell pepper, broccoli florets, and carrot slices with a light spray of olive oil on a separate baking tray.
Roast the vegetables in the oven for 15-20 minutes until tender and slightly charred on the edges.
Once cooked, drizzle the sweet and sour sauce over the crispy chicken or serve on the side as a dipping sauce.
Plate the chicken with a generous serving of the roasted vegetables and enjoy your balanced, flavorful meal.