Form Olive Garden. I haven't made these yet, but I think I will try it without the sauce. Update: I made these tonight and was going to make the sauce, but didn't have time. I had to substitue Italian bread crumbs for the croutons and I added chopped mushrooms stems. I also sprinkled with lemon juice after they were cooked and it was wonderful! I also used portobello and regular mushrooms-both were good!