Preheat your oven to 425°F and line a baking sheet with parchment paper.
Pat the chicken breast dry and place it between two sheets of plastic wrap. Gently pound to an even thickness for uniform cooking.
In a shallow bowl, whisk the egg white until slightly frothy. In another small bowl, add the panko breadcrumbs.
Dip the chicken breast first in the egg white, ensuring it is well-coated, then dredge evenly in the panko breadcrumbs.
Place the breaded chicken on the prepared baking sheet. Lightly spray or drizzle the olive oil over the top for extra crispiness.
Bake the chicken for about 18-20 minutes or until the internal temperature reaches 165°F and the coating becomes golden and crunchy.
While the chicken is baking, prepare the sweet and sour sauce by combining the pineapple chunks, honey, low sodium soy sauce, and rice vinegar in a small saucepan. Simmer on low heat for 3-4 minutes until slightly thickened, stirring occasionally.
Once cooked, drizzle the warm sweet and sour sauce over the crispy baked chicken or serve it on the side as a dip.
Garnish with additional pineapple pieces or a sprinkle of fresh herbs if desired, and serve immediately.