Heat a small amount of oil in a large frying pan. Add chicken, peppers, and onions and cook over medium heat until chicken is cooked through.
Add 1/2 c. buffalo sauce and continue cooking 1-2 minutes, stirring to combine.
Spoon mixture into buns.
Top each with 2 slices provolone cheese and place under broiler for 2 minutes to melt cheese.
Remove from oven; sprinkle with blue cheese (optional) and top with additional buffalo sauce and/or ranch dressing.