Chicken Empanadas

Name: Chicken Empanadas
Ingredients: 2 tablespoons olive oil; 1 yellow onion, diced; 0.5 cup diced poblano pepper; 4 cloves garlic, chopped; 1 teaspoon kosher salt; 0.5 teaspoon freshly ground black pepper; 1.5 teaspoons ground dried chipotle pepper; 0.5 teaspoon ground cumin; 0.25 teaspoon dried Mexican oregano; 1 pinch cayenne pepper, or to taste; 3 cups diced cooked chicken; 2 tablespoons dried currants; 2 (10 ounce) cans diced tomatoes with green chile peppers (such as RO*TEL®); 0.33 cup water; 0.75 cup grated pepper Jack cheese; 1 large egg, beaten; 2 teaspoons water; 3 cups all-purpose flour; 1.5 teaspoons kosher salt; 1 teaspoon white sugar; 12 tablespoons cold unsalted butter; 0.33 cup cold water, or as needed