Preheat oven to 350 degrees. Place cornstarch in a shallow dish. Dredge each chicken piece in cornstarch then dip in beaten egg. Heat oil in frying pan. Add chicken and cook until lightly browned (doesn't need to be cooked through).
Place drained pineapple tidbits, pepper, and onion in the bottom of a 9x13 pan. Position chicken tenders evenly over pineapple and vegetables.
In a medium bowl, whisk together sauce ingredients. Pour evenly over chicken. Bake for 45 min - 1 hour turning once after 30 minutes.
If you like lots of sauce for extra dipping... double it and pour half over the chicken (as the recipe calls for) and simmer the other half in a small saucepan for 10-15 minutes. If you want to thicken up the sauce combine about 1 Tbsp of cornstarch with 1/4 c. water. About 5 min before serving, SLOWLY whisk in cornstarch mixture to simmering sauce until the consistency is where you want it. You may not need all of the cornstarch mixture.