Absolutely. For vegetarian fajita tacos simply replace the chicken with extra fajita veggies or add other vegetables such as mushrooms, butternut squash, black beans, sweet potatoes, spinach, or kale. If you wish to add mushrooms, spinach, or kale, sauté before adding to the tacos. For the butternut squash and sweet potatoes, cut into cubes and roast until tender before building the tacos. Rinse the black beans before adding them to the tacos. This homemade enchilada sauce is made with vegetable broth, so no modifications are needed for a vegetarian dish.