Creating Baked Sweet and Sour Chicken is a breeze if you follow these straightforward steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare Chicken: Cut the chicken into bite-sized pieces. Season with salt and pepper.
3. Combine Sauce Ingredients: In a medium bowl, whisk together the sugar, apple cider vinegar, ketchup, soy sauce, garlic powder, and ginger powder until well combined.
4. Mix Vegetables: In a large baking dish, combine the chopped bell peppers, onion, and pineapple chunks.
5. Add Chicken: Place the seasoned chicken pieces on top of the vegetables in the baking dish.
6. Pour Sauce: Pour the sweet and sour sauce over the chicken and vegetables, ensuring everything is well-coated.
7. Bake: Cover the baking dish with aluminum foil and bake for 30 minutes.
8. Check for Doneness: After 30 minutes, remove the foil and bake for an additional 10-15 minutes, or until the chicken is cooked through and the sauce is bubbling.
9. Thicken Sauce (Optional): If you prefer a thicker sauce, mix cornstarch with water in a small bowl. Stir into the sauce and bake for another 5 minutes.
10. Garnish and Serve: Remove from the oven, garnish with sesame seeds and sliced green onions. Serve warm.

These steps will guide you in creating an incredible dish that is sure to delight everyone at your table.