Preheat oven to 325 degrees. Cut chicken breasts into bite-sized pieces and season with salt and pepper. Place cornstarch and beaten eggs in separate bowls. Dip chicken into cornstarch then coat in egg mixture. Heat canola oil in a large skillet over medium-high heat and cook chicken until browned. Place the chicken in a 9 x 13 greased baking dish. In a medium sized mixing bowl, whisk together sugar, ketchup, vinegars, soy sauce and garlic salt. Pour over chicken and bake for one hour.