Vegetarian Sheet Pan Burritos

Name: Vegetarian Sheet Pan Burritos
Ingredients: 1/2 cup long grain white rice; 3/4 cup water; 3/4 teaspoon salt , divided; 1/4 cup chopped fresh cilantro; 1 1/4 pounds sweet potato (4 cups cubed); 1/2 cup chopped red onion (about 1/4 of a large onion); 2 large jalapeños , seeded and sliced; 1 ( 15 - ounce ) can chickpeas , drained and rinsed; 1/2 cup coarsely chopped walnuts; 1 tablespoon extra virgin olive oil; 1 teaspoon ground cumin; 1/2 teaspoon ground chipotle pepper; 2 cups baby spinach , packed; 6 to 7 ( 10 - inch ) flour tortillas; 2 large avocados , freshly sliced; 1/2 large lime; Hot sauce , to serve