Cook sausage over medium heat until well browned; drain. Stir in the onions and also brown. When completed, open can of rolls and stretch the dough until thin without splitting or tearing. In the wide part of the dough, add the sausage and onion mixture, put cheese on top of that. Then roll the dough as you would a regular cresent roll. Make sure you pinch all the open areas closed. Bake in preheated oven at 190ºC for 10 to dozen minutes.