Sheet Pan Vegetarian Fajitas are an oven-baked, healthy version of the classic Mexican restaurant favorite. Made with bell peppers, onion, zucchini, and portobello mushrooms these fajitas are loaded with fresh veggies and a Homemade Taco Seasoning. This 20-minute meal is super easy to make and the perfect weekday meal. Adjust your toppings to make these also vegan, gluten-free, dairy-free, or low carb.