For the Chicken:

• 1.5 lbs boneless, skinless chicken breasts, cut into 1-inch cubes

For the Vegetables:

• 1 large red bell pepper, cut into 1-inch pieces
• 1 large yellow or orange bell pepper, cut into 1-inch pieces
• 1 red onion, cut into wedges
• 1 (20 oz) can pineapple chunks, drained (reserve juice)

For the Sauce:

• 1/4 cup soy sauce
• 3 tablespoons brown sugar
• 2 tablespoons pineapple juice (from the can)
• 1 tablespoon cornstarch
• 1 teaspoon garlic powder
• 1/2 teaspoon ginger
• 1/4 teaspoon red pepper flakes (optional)

Additional:

• 1 tablespoon olive oil