This is the recipe from Pinterest that I used, and I followed it pretty much as it is, but I thought it might work better to combine the eggs with the cornstarch to make a batter, because that's pretty much how it turned out anyway. I didn't cook it as long either, probably between 30-40 min. The sauce is really good. I use it as dip for Cream Cheese Wontons. I probably won't buy it anymore.
Baked Sweet and Sour Chicken
The chicken coating:
3-4 boneless chicken breasts
salt + pepper
1 cup cornstarch
2 eggs, beaten
1/4 cup canola oil
The sweet and sour sauce:
3/4 cup sugar
4 tbs ketchup
1/2 cup distilled white vinegar
1 tbs soy sauce
1 tsp garlic salt
Start by preheating your oven to 325 degrees. Rinse your chicken breasts in water and then cut into cubes. Season with salt and pepper to taste. Dip chicken into the cornstarch to coat then dip into the eggs. Heat your 1/4 cup oil in a large skillet and cook your chicken until browned but not cooked through. Place the chicken in a 9x13 greased baking dish. Mix all of your sweet and sour sauce ingredients in a bowl with a whisk and then pour evenly over the chicken. Bake for one hour and during the baking process you will need to turn the chicken every 15 minutes.
