Spicy Chicken and Pickled Jalapeno Empanadas

Name: Spicy Chicken and Pickled Jalapeno Empanadas
Ingredients: 1/2 cup pickled jalapenos; 1 cup Monterey Jack cheese; 1 large chicken breast (or 2 smaller breasts); 1 Tablespoon crushed New Mexican chile or your choice of chili powder; 1/2 teaspoon chipotle powder (optional); 1/4 teaspoon salt; freshly ground pepper; 1 tablespoon olive oil; 2-3 tablespoons chopped onion; 3 1/4 cups all purpose flour; 6 oz. butter (1.5 sticks); 1.5 teaspoons salt; 2 small eggs; 1/2 cup ice cold water; 1.5 tablespoons apple cider vinegar (or white vinegar); 1 egg (for the eggwash)