Chef John's Chicken Tinga

Ingredients (13)

• ✓ 3 pounds skinless, boneless chicken thighs
• + 3 peeled whole garlic cloves add to pantry
• + 1 large yellow onion, halved add to pantry
• + 2 teaspoons kosher salt, plus more to taste add to pantry
• + ½ teaspoon dried oregano add to pantry
• + 4 cups chicken stock add to pantry
• + 1 cup water add to pantry
• + 2 tablespoons olive oil add to pantry
• + 1 large onion, diced add to pantry
• + 1 (7 ounce) can chipotle peppers in adobo sauce add to pantry
• + 1 (28 ounce) can peeled plum tomatoes (preferably San Marzano) add to pantry
• + 2 tablespoons crumbled cotija cheese, or to taste add to pantry
• + 3 tablespoons chopped fresh cilantro, or more to taste add to pantry