Chicken Sausage Sub with Sautéed Peppers and Onions

cooked chicken sausage(s)

3 oz, (1 precooked link; Italian variety)

reduced calorie hot dog bun(s)

1 item(s)

mustard

½ Tbsp, (spicy variety)

raw Cubanelle pepper

1 cup(s), (or thinly sliced)

uncooked onion(s)

1 cup(s), (white, thinly sliced)

olive oil

1 tsp

table salt

1 pinch(es), (or to taste)

black pepper

1 pinch(es), (or to taste)