Spicy Pork Chops with Black Beans

Name: Spicy Pork Chops with Black Beans
Ingredients: 4 bone-in pork chops (1/2 inch thick; about 5 ounces each); Kosher salt and freshly ground pepper; 1/4 cup plus 2 tablespoons medium-hot red enchilada sauce; 1/2 teaspoon chipotle chile powder; 2 tablespoons plus 1 teaspoon extra-virgin olive oil, plus more for the pan; 1 small red onion (1/2 thinly sliced, 1/2 chopped); 2 tablespoons fresh lime juice; 1/2 cup roughly chopped fresh cilantro leaves, plus 2 teaspoons minced stems; 1 15-ounce can black beans, not drained; 8 small corn tortillas; 1 avocado, sliced