To prepare a vegetarian tortilla stew recipe, first you need to prepare your ingredients. First, you'll need your tortillas. You can use any type of tortilla you like, as long as it's not too stale. If you don't want to use refried beans, use white beans instead. Then, add your spices and seasonings, and mix everything together until everything is evenly mixed. Next, heat up your oven to 375 degrees Fahrenheit (190 degrees Celsius) and add in your vegetables. Cook until the vegetables are tender, about 20 minutes. Add your beans and cook for an additional 10 to 15 minutes, until they're heated through.