Chicken Sausage Sub with Sautéed Peppers and Onions

cooked chicken sausage

3 oz, (1 precooked link; Italian variety)

reduced calorie hot dog bun

1 item(s)

mustard

½ Tbsp, (spicy variety)

cubanelle pepper

1 cup(s), (or thinly sliced)

onion

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)