2Cut chicken breast into 1-inch pieces and red bell pepper into 1-inch pieces.
3Mix chicken with cornstarch, baking powder, garlic powder, ginger powder, salt, and pepper.
4Arrange chicken and peppers on a lined baking sheet, spray with oil, and bake for 7-10 minutes, flip, spray again, and bake for an additional 7-10 minutes until golden and cooked through.
5In a pan, combine soy sauce, hoisin sauce, brown sugar, minced ginger, and red pepper flakes. Simmer on medium heat.
6Add cornstarch slurry and cook for 2-3 minutes until thickened.
7Toss the baked chicken and peppers with the warm sauce.