Pre-heat oven to 400 degrees F
Cut chicken into cubes. Pat dry to remove all excess water.
In a flat bowl, combine flour, cornstarch and salt. Mix well
In another bowl, whisk one egg
Coat chicken pieces with egg mixture and then flour mixture. Coat one by one in flour mixture. Generously coat each piece in flour mixture at least 3-4 times.
Line baking sheet with aluminum foil. Spoon 2 tbsp or more vegetable oil onto aluminum foil and brush evenly all over. Ensure there is a thin layer of vegetable oil all over to help with easy removal of chicken pieces when baking is completed. Place chicken, without overlapping or touching, onto lined baking sheet.
Bake in the oven for 15 minutes, then remove baking sheet from oven, and flip every chicken piece over. Bring back into the oven and bake for another 15 minutes.
While waiting for chicken to bake, add orange marmalade, minced garlic, soy sauce and red pepper flakes into a small pot. Bring it to boil on medium low heat, then cook on low for a few minutes, stirring continuously, until sauce thickens slightly. Remove from heat.
Once chicken is done, move chicken promptly from baking sheet to a large bowl. Add orange sauce to bowl and toss chicken in sauce.
Serve with white or brown rice. Enjoy!