Heat oven to 450 degrees or grill on medium. Spread part of the honey mustard onto crust. Add 1 cup of cheese. Mix honey mustard with chicken and add to crust. Sprinkle with bacon, onion and remaining cheese.
Place pizza in the oven (on center rack) or on the grill for 8-10 minutes, long enough to melt the cheese. Remove from oven, slice and serve.