Chicken Tinga Tostadas: My Family's Fiesta Fave!

Ingredients

• 2 lbs (900g) boneless, skinless chicken thighs
• 1 tablespoon olive oil
• 1 medium onion, chopped (about 1 cup)
• 2 cloves garlic, minced
• 1 teaspoon dried oregano
• 1/2 teaspoon ground cumin
• 1/4 teaspoon ground cloves
• Salt and black pepper to taste
• 4 dried chipotle peppers, stemmed and seeded
• 2 dried guajillo peppers, stemmed and seeded
• 2 cups (475ml) chicken broth
• 1 (28 oz / 800g) can crushed tomatoes
• 1 tablespoon apple cider vinegar
• 1 teaspoon brown sugar (optional)
• 12 corn tortillas
• Vegetable oil, for frying
• Shredded lettuce or cabbage (optional)
• Crumbled cotija cheese or queso fresco (optional)
• Sour cream or Mexican crema (optional)
• Diced avocado (optional)
• Pickled onions (optional)
• Salsa verde (optional)
• Chopped cilantro (optional)
• Lime wedges (optional)