Step 1: Prepare the Sauce
Add tomatoes, onion, garlic, chipotle peppers, adobo sauce, oregano, cumin, and chicken broth to a blender. Blend until completely smooth.
Step 2: Cook the Sauce
Heat olive oil in a large skillet over medium heat. Pour in the blended sauce and cook for 5 to 7 minutes, stirring occasionally until slightly thickened.
Step 3: Cook the Chicken
Add chicken breasts directly to the sauce. Cover and simmer for approximately 20 minutes or until fully cooked and tender.
Step 4: Shred the Chicken
Remove the chicken from the pan and shred using two forks.
Step 5: Combine Chicken and Sauce
Return the shredded chicken to the skillet and stir until every piece is coated in the smoky sauce.
Step 6: Warm the Tostadas
Place tostadas in a 350°F (175°C) oven for 3 to 5 minutes to restore crispness.
Step 7: Assemble
Layer shredded lettuce onto each tostada. Add a generous spoonful of Chicken Tinga.
Step 8: Add Toppings
Top with avocado slices, crema, queso fresco, cilantro, and a squeeze of fresh lime.
Step 9: Serve Immediately
Serve while the tostadas remain crisp and enjoy immediately.