I'm not Catholic but I dated a guy who was. Every Friday during Lent, his church would open up a soup kitchen with meatless soups. I would make a huge pot of soup to take. My most well-received were Clam Chowder, Corn Chowder and Baked Potato Soup.
The Baked Potato Soup is best with crumbled bacon on top but I just omitted it and used cheese, green onions and sour cream on top.