Preheat oven to 450 degrees. Lightly coat a large baking sheet with nonstick spray.
Whisk together olive oil, soy sauce, cumin, chili powder, and garlic powder in a small bowl.
Place the portobellos, peppers, and onion in a large bowl, then drizzle oil mixture over top. Mix well.
Spread veggies on baking sheet in a single layer (use 2 if they're crowded). Roast for 15 minutes, then flip and cook for another 10 to 15 minutes, or until tender and browned.
Remove veggies from oven, then season to taste with salt.
Prepare Guacamole:
While veggies are roasting, cut avocados in half, remove pits, and scoop flesh into a medium bowl.
Lightly mash the avocado, then stir in lime juice and garlic.
Season generously with salt and hot sauce to taste.
Serving the Fajitas:
Wrap 4 tortillas in a paper towel and microwave until hot (about 30 seconds). Repeat process with remaining tortillas.
To eat, top tortillas with roasted veggies and your choice of toppings. Serve with a lime wedge. Enjoy!
Notes
This recipe makes 12 fajitas. Assuming most people will eat 2 to 3 fajitas, it should serve 4 to 6 people.You can use either flour or corn tortillas for serving. For a gluten free option, use corn tortillas and replace the soy sauce with tamari.Make sure to read the info before this recipe card for tons of tips, topping ideas, and serving suggestions!