Prep Oven & Chicken: Preheat oven to 375°F. Line a baking sheet with foil and fit with a wire rack; spray rack with non stick spray. Whisk egg in a shallow bowl. In a large zip top bag, combine flour, 2 tbsp cornstarch, salt, pepper, onion powder, garlic powder, cayenne, and 1/4 tsp cumin.
Bread Chicken: Dip chicken pieces in egg, then add to the flour bag. Seal and shake to coat evenly. Place chicken in a single layer on the prepared rack.
Bake: Bake for 10-12 minutes, until chicken is cooked through.
Broil: Switch oven to HIGH broil. Broil chicken on top rack for 2-3 mins until golden and crisp. Transfer to a bowl.
Make Sauce: While chicken bakes, add all sauce ingredients (chipotle through 1 tsp cornstarch) to a blender. Blend until completely smooth.
Cook Sauce: Pour sauce into a saucepan. Cook over medium high heat for 5 mins, stirring constantly, until thickened.
Coat & Serve: Pour hot sauce over crispy chicken and toss gently to coat. Serve immediately over cilantro lime rice and black beans, with desired veggies and garnishes.