Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Cut the chicken breast into bite-sized pieces.
In a bowl, whisk together the egg white, garlic powder, ginger powder, a pinch of salt, and pepper.
Place the whole wheat breadcrumbs in another bowl.
Dip each chicken piece first into the egg white mixture, then coat evenly with the breadcrumbs.
Arrange the breaded chicken pieces on the prepared baking sheet.
Bake the chicken for 18-20 minutes, or until cooked through and crispy, flipping halfway through.
While the chicken bakes, prepare the sweet and sour sauce by combining pineapple juice, rice vinegar, low sodium soy sauce, pineapple chunks, and chopped red bell pepper in a small saucepan.
Simmer the sauce over medium heat for 5 minutes to meld the flavors.
Once the chicken is done, plate it and drizzle the warm sweet and sour sauce over the top.
Serve immediately and enjoy your balanced, crispy, and flavorful meal.