Start by heating your oven to 400°F (200°C). Grab a baking sheet and line it with parchment paper for an easier cleanup later.
In a large bowl, gently combine the ground chicken, breadcrumbs, onion, egg, soy sauce, garlic powder, salt, and pepper.
Roll the mixture into 1-inch balls and arrange them on your prepared baking sheet. You should get about 20-25 meatballs.
Bake the meatballs for 20-25 minutes. You're looking for a nice golden brown color and for them to be cooked through.
In a saucepan, combine sugar, pineapple juice, soy sauce, garlic powder, and ketchup. Heat this over medium heat until it starts to bubble. Now is the time to add a few drops of red food coloring to give the sauce that nice red color.
Mix cornstarch and water in a small bowl. Stir this into your saucepan. Keep cooking and stirring for a few more minutes until the sauce thickens to your liking.
Once the meatballs are baked, gently toss them in the sweet and sour sauce, ensuring they're evenly coated.
Serve these meatballs over a bed of rice or noodles. Sprinkle some sesame seeds or chopped green onions for an extra touch.