Sweet Potato and Chicken Lavash Wraps

Name: Sweet Potato and Chicken Lavash Wraps
Ingredients: 6 tablespoons unsalted butter; 1 onion, finely diced; 1 large red jalapeno pepper (1/2 sliced, 1/2 minced; remove seeds for less heat); 1 tablespoon chopped fresh thyme; 3 cloves garlic, minced; 1 tablespoon grated peeled fresh ginger; 1 tablespoon curry powder; 1 pound sweet potatoes, peeled, quartered lengthwise and sliced 1/2 inch thick; Kosher salt and freshly ground pepper; 3 cups shredded rotisserie chicken (about 12 ounces); 4 9-inch-square lavash flatbreads; 1/4 cup fresh cilantro