Rather than use your same recipes with the meat cut out, try some that were designed just for vegetarians. Veggie web is a good site for that. Chili is a good thing to veganize. I like Boca grounds in mine and add beans and roasted corn, then serve it over brown rice. I also find that Indian dishes are very hearty and there are many, many veg dishes that are Indian. Asian stir fry with tofu and brown sauce over rice is also very hearty and filling, and flexible. My husband is a big guy who works out and is athletic, and he eats vegetarian with a ton of vegan meals.