Preheat oven to 450ºF (~232ºC). Line a baking sheet with foil or parchment paper, and spray it with cooking spray. It is very important to line your baking sheet. The natural juices of the chicken will leak out and burn during the baking process.
Spray the chicken breasts with cooking spray, and sprinkle the spices on top of the chicken. Feel free to add your own spices.
Bake the chicken for 10 minutes. Then, flip them over, spray it with more oil, and bake for another 10 minutes. Cut into the thickest part of the chicken to make sure that they are fully cooked. Once they are out of the oven, loosely cover the chicken breasts with another piece of foil and let it rest for 5 minutes.
Using Blade C of a spiralizer, make cucumber and radish noodles. If you do not own a spiralizer, simply chop the cucumber into thin matchsticks, and thinly slice the radishes.
Combine the cucumber, radishes, pepper, and scallions into a large bowl. Mix them with the fish sauce, rice vinegar, sesame oil, honey, and soy sauce. If you do not have fish sauce, just use soy sauce only. You may need to add a tiny bit more rice vinegar and honey to balance the additional salty flavor.
Top the salad with sesame seeds and serve with the chicken breasts.