We were at Costco and had the pupusa and guacamole sample...a-maz-ing. So good. However, I didn't want to spend $12 for 12, that seemed too expensive. I came home and when to allrecipes. I love allrecipes - they have everything and the comments from everyone are always so helpful. I found this recipe and followed the comments that some readers had made. I started with tortilla mix that I had on hand, added the water, made a ball of dough, spreading it out, filling it with the cheese (sometimes also beans), pinching it closed on top, and then rolling or patting flat again. Then you heat it in a skillet for about 2 min a side and wa-lah, you're done.