Preheat oven to 425 degrees F.
Make the sauce by coming all ingredients and stirring until smooth. (The sauce can be made up to 1 week in advance).
Season the chicken breast on both sides with salt and pepper and 1 tsp of cajun seasoning.
Grill for several minutes on each side, only flipping once, until cooked through.
Remove to a plate and allow to rest for 5 minutes, then chop into bite-size pieces.
Spread a thin layer of sauce over the flatbread.
Sprinkle with cheese, chopped chicken, bell peppers and onion.
Bake @425 degrees for 8-10 minutes.
Remove from oven and top with chopped avocado and cilantro.
Add remaining aioli sauce to a ziplock bag.
Cut a tiny piece of the corner off and drizzle a little bit of cajun sauce on top. Serve warm.
