Pizza Stone Grilled Chicken Fajitas

Name: Pizza Stone Grilled Chicken Fajitas
Ingredients: 3 tablespoons olive oil; 1 tablespoon chili powder; 1 tablespoon chipotle in adobo sauce, chopped; 1 tablespoon ground cumin; 1 tablespoon garlic powder; Juice of 1 lime; Kosher salt and pepper; 1 pound bell peppers, cut into 1/4-inch-thick slices; 1 small red onion (about 3 ounces), cut into 1/4-inch-thick slices; 1 pound boneless, skinless chicken breast, cut into 1/2-inch-thick slices; 8 fajita-size tortillas, warmed; Guacamole, pico de gallo, hot sauce and sour cream, for serving