Whisk together all the sauce ingredients in a small bowl.
1/4 cup apple cider vinegar, 1/4 cup ketchup, 1/2 cup brown sugar, 1 tbsp. soy sauce, 1/2 tsp. garlic powder, 1/4 tsp. ground ginger
Season chicken with salt and pepper. Add cornstarch to a shallow bowl and add chicken. Toss until well coated.
1.5 pounds boneless skinless chicken breast, 1 tsp. salt, 1/2 tsp. black pepper, 1/3 cup cornstarch
Heat 2 tbsp. oil in a large skillet over medium-high heat. Add chicken and cook for 6-7 minutes until cooked through. Place cooked chicken on a plate.
3 tbsp. vegetable oil
Add 1 tbsp. oil to the pan and add onion, bell pepper and broccoli. Sauté for 3 minutes.
1 small red onion, 1 red bell pepper, 2 cups fresh broccoli florets
Add garlic and pineapple chunks. Cook another minute.
1 tsp minced garlic, 20 oz. can pineapple chunks
Place the chicken back in the pan and add the sauce. Stir until well-coated and let mixture simmer 1-2 minutes.
Remove from heat and serve with rice or noodles.