Fajita Stuffed Sweet Potatoes

Name: Fajita-Stuffed Sweet Potatoes
Ingredients: 4 sweet potatoes (about 10 ounces each); 3 tablespoons unsalted butter, at room temperature; Grated zest of 1/2 lime, plus wedges for serving; 2 tablespoons chopped fresh cilantro, plus more for topping; Kosher salt; 1 pound skirt steak, cut into 1-inch cubes; 4 teaspoons fajita seasoning; Freshly ground pepper; 2 teaspoons vegetable oil; 1 red onion, chopped; 2 bell peppers (1 red and 1 green), chopped; 1 jalapeño pepper, chopped; Guacamole, sour cream, hot sauce and cotija cheese, for topping; Tortilla chips, for serving