Southwest Chicken Casserole

Name: Southwest Chicken Casserole
Ingredients: 1 pound boneless chicken thighs, skinless, cut into pieces; Kosher salt; Freshly ground black pepper; 2 tablespoons extra-virgin olive oil; 1 onion, chopped; 2 garlic cloves, minced; 1/2 teaspoon ground cumin; 1 teaspoon dried oregano, crumbled; 1 tablespoon chopped chipotles in adobo; 1 (15 ounce) can whole tomatoes in juice; 3/4 cup cornmeal; 1/4 cup all-purpose flour; 1/4 teaspoon baking powder; 1/4 teaspoon baking soda; 1 large egg; 3/4 cup buttermilk; 2 tablespoons unsalted butter, melted and cooled; 1/3 cup pickled jalapeños