Here’s how to create this incredible Sweet and Sour Chicken dish, step-by-step:

1. Prep the Chicken: Begin by cutting the chicken breasts into bite-sized pieces. Set aside.
2. Coat the Chicken: In a bowl, mix the flour, garlic powder, salt, and black pepper. Toss the chicken pieces in the flour mixture until evenly coated.
3. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Cook Chicken: Add the coated chicken pieces to the skillet. Cook until golden brown, about 5-7 minutes, turning occasionally. Remove the chicken and set aside.
5. Sauté Vegetables: In the same skillet, add the bell peppers and onions. Sauté for 3-4 minutes until they start to soften.
6. Add Pineapple: Mix in the pineapple chunks and sauté for another minute.
7. Prepare Sauce: In a bowl, combine the sugar, vinegar, ketchup, and soy sauce. Stir well to combine.
8. Combine all Ingredients: Add the chicken back into the skillet with the sautéed vegetables. Pour the sweet and sour sauce over the mixture.
9. Simmer: Stir to combine and let it simmer for 5-7 minutes, allowing the flavors to meld.
10. Thicken the Sauce (optional): If you prefer a thicker sauce, mix cornstarch and water in a small bowl. Add to the skillet and stir until the sauce thickens.
11. Serve: Remove from heat and enjoy immediately!

Following these straightforward steps will lead to a delicious homemade Sweet and Sour Chicken that will soon become a favorite in your household.