Grilled Chicken Fajitas Platter

Name: Grilled Chicken Fajitas Platter
Ingredients: 1/4 cup lime juice (about 3 limes); 1/4 cup extra-virgin olive oil; 4 cloves garlic, minced; 1 teaspoon salt, plus more for sprinkling; 1/2 teaspoon freshly ground black pepper, plus more for sprinkling; 4 boneless chicken breast halves, skinned (about 2 pounds); 4 scallions, tops removed; 1 yellow onion, quartered; 1 green bell pepper, halved, seeded; 1 red bell pepper, halved, seeded; Shredded Cheddar, for serving; Sour cream, for serving