Prepare the grill for direct grilling over high heat.
Combine cayenne, paprika, sugar and salt to create the seasoning blend for the chicken. Pound the chicken breast out to a uniform half-inch thickness (palliard). Lightly brush with olive oil on both sides. Sprinkle the seasoning blend onto the chicken (use it all).
Grill over high heat until cooked through, turning once, about 8 minutes total cooking time. Remove from the grill, slice, and toss in a bowl with the hot sauce.
Fold the celery seed into the whipped heavy cream.
Working on a lightly floured surface (we use Caputo ’00 flour), form the dough ball into a 10-inch pizza. Spread the whipped cream evenly onto the dough. Distribute the blue cheese, followed by the chicken and green onion.
Place the pizza on a pizza peel and transfer to the oven or grill. Cook until the cheese is melted and the crust is nicely browned.
Cooking in a hot pizza oven will take less than 3 minutes. Cooking in a conventional oven at 500⁰F, or on a grill, will require closer to 10 minutes.
Remove from the oven. Drizzle on a little more hot sauce and then top with chopped fresh celery greens.