Turn a large skillet or Dutch oven on to medium high and saute the peppers, onion, and garlic until soft.

Add the chicken and cook until it is browned. Drain the grease if necessary.

Add the tomato sauce, mustard, paprika, and soy sauce and stir to combine.

Continue to simmer for 10-15 minutes to let some of the liquid evaporate.

Add salt and pepper to taste.

Serve on buns.