Creating Baked Sweet and Sour Chicken is simple if you follow these clear steps:

1. Preheat Oven: Preheat your oven to 400°F (200°C).
2. Prepare Chicken: In a large bowl, season the cubed chicken with salt and pepper.
3. Mix Sauce: In a separate bowl, whisk together the brown sugar, apple cider vinegar, ketchup, soy sauce, and cornstarch mixed with water until well combined.
4. Combine Ingredients: Add the chopped bell peppers, onion, and garlic to the chicken, mixing well.
5. Add Sauce: Pour the sweet and sour sauce over the chicken and vegetables, stirring to coat everything evenly.
6. Bake: Transfer the mixture to a baking dish and bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through and tender.
7. Serve: Remove from the oven and let it cool for a couple of minutes before serving.

These straightforward steps will guide you through making this incredible dish effortlessly.