Cut the chicken into bite-sized pieces. Lightly coat the chicken with one tablespoon of the corn starch.
Place the chicken into the air fryer basket in a single layer. Cook the chicken at 400 degrees F for 8 minutes.
While the chicken is cooking, melt a tablespoon of butter in the microwave. Brush the chicken evenly with the melted butter.
Cook the chicken an additional 2 - 5 minutes at 400 degrees F, or until the chicken is 165 degrees F in the center (check a few of the pieces with a digital meat thermometer).
While the chicken is cooking, prepare the sauce: whisk together the remaining one tablespoon of the cornstarch with a couple of tablespoons of the orange juice until the cornstarch is completely dissolved.
Add the cornstarch dissolved into the orange juice to a non-stick sauce pan.
Add the remaining orange juice, brown sugar, soy sauce and crushed red pepper. Bring the mixture to a boil, reduce the heat and simmer the sauce for about 10 minutes, until the sauce has reduced and thickened.
Remove the sauce from the heat and stir in the sesame oil.
Once the chicken is done cooking in the air fryer, toss it with about half of the orange sauce.
Serve the chicken on top of your choice of rice with the rest of the sauce (plus chopped green onions) to pass at the table.