The bread (I had spelled white bread and also low carb bread - my best) is best toasted beforehand. Then brush with the BBQ sauce. Peel the sausage and cut it into slices. Place evenly on the bread. Spread the fried onions on top and place the cheese on top. Bake in the oven for about 6 minutes until the cheese has the desired condition.
Alternatively, you can also use fried sausage (e.g. use leftovers) and freshly fried onions. Vegetarians take vegetarian meat sausage, vegan vegan sausage and cheese.