Cook sausage and onions, stirring often. This keeps the sausage in small chunks. (I like to fry the sausage in water because that helps drain off more of the fat.) Add cheese and seasoning and heat until cheese is melted. Put bread slices on a cookie sheet and spread the mixture over the bread. Freeze until ready to serve. When ready to serve, remove from the freezer and bake at 350 degrees for 15 minutes.