In a medium mixing bowl, add cornstarch, salt and black pepper. Stir to combine fully. Thinly slice the boneless skinless chicken into strips. Add the sliced chicken to the cornstarch mixture. Stir until all of the chicken is coated completely.
Add ⅓ cup vegetable oil to a cast iron skillet over medium heat. Once the oil is heated, add half of the cornstarch coated chicken. The chicken will fry in two batches. Allow each batch to cook for 15 minutes or until cooked through. Once each batch is cooked, transfer to a paper towel lined plate. You may add a little bit of salt to taste.
While the chicken is frying, prepare the Orange Sauce. In a medium mixing bowl, zest and juice 2 large oranges and combine the remaining ingredients. Stir to combine fully. Also in the meantime, chop the garlic, Thai chilis and broccoli. Cut the broccoli crowns as well as the stems.
In the same cast iron skillet on medium heat, add the remaining ¼ cup of vegetable oil, garlic, ginger and Thai chilis and broccoli. Cook for 2 minutes while stirring frequently.
Add the cooked chicken and the Orange Sauce to the skillet. Let simmer for 12-15 minutes until thickened. Stir occasionally. NOTE: Be patient. It may seem like a lot of Orange Sauce, but the cornstarch on the chicken will thicken the sauce. Serve with jasmine rice and garnish with some green onion. Enjoy!