Start by cutting the chicken breast in half longways and then cut each longways piece into roughly 1 inch cubes. Making them about the same size will allow them to cook evenly when frying them.
Do this optional step if you want a little coating on your chicken. It helps the sauce to stick to the chicken and you don't taste it once it's done! In a small bowl, add 1/4 cup of baking powder. Place a small amount of cubed chicken in the baking powder to coat it lightly. Repeat until all the chicken cubes have been coated and set aside to fry them.
In a large frying pan over medium heat, add about 2 tbs of avocado or olive oil. Wait until it's fully heated before adding the chicken.
Fry the chicken for about 3 to 5 minutes on each side. Be sure to flip the chicken halfway through the cooking process. You can tell when you need to flip the chicken because it will shrink a bit and turn white on the outer edges of the chicken cubes.
Flip the chicken and cook until it has fully cooked all the way through. This means it's white in the center and still tender enough to cut with a fork. Remove the chicken from the frying pan and place it on a place.
Wipe down the frying pan and start to make the orange sauce.
Over low to medium heat, add the sugar free marmalade and bbq sauce. Cook it until it starts bubble. This will allow the sauce to incorporate and thicken up even more.
Now add the precooked chicken and stir. Top with green onions and or sesame seeds as an option!
Serve it with a side of steamed broccoli or riced cauliflower to keep the carb count low.