Cheesy Chicken Enchiladas

Name: Cheesy Chicken Enchiladas
Ingredients: For The Enchiladas:; 2 tablespoons butter; 1/2 cup chopped onion; 4 cloves garlic, minced; 1 teaspoon ground coriander; 1/4 teaspoon pepper; 1/2 teaspoon salt; 1 teaspoon pickled jalapeno pepper slices, chopped; 3 tablespoons all-purpose flour; 8 ounces sour cream; 2 cups chicken broth; 3 1/2 cups grilled thinly sliced chicken; 8 flour tortillas; 2 cups shredded Monterey Jack cheese; 1/2 cup shredded yellow cheddar cheese; For The Garnish:; Fresh cilantro, chopped; Tomatoes, finely chopped; Green onions, thinly sliced; pickled or fresh jalapenos, finely chopped (optional)