Creating Tinga de Pollo Tostadas is easy when you follow these detailed steps:

1. Cook the Chicken: In a pot, cover the chicken breasts with water. Add salt and boil for 20-25 minutes, or until fully cooked.
2. Shred the Chicken: Once cooked, remove the chicken and let it cool. Shred it using two forks.
3. Sauté Onions and Garlic: In a skillet, heat vegetable oil over medium heat. Add the sliced onion and sauté until translucent. Then add the minced garlic and cook for another minute.
4. Add Tinga Ingredients: To the skillet, add the shredded chicken, diced tomatoes, chipotle peppers, oregano, cumin, salt, and pepper. Stir to combine well.
5. Simmer: Reduce the heat to low and let the mixture simmer for 10-15 minutes, allowing the flavors to meld.
6. Prepare Tostadas: While the chicken simmers, arrange the tostadas on a serving platter.
7. Assemble Tostadas: Spoon the Tinga mixture generously on each tostada.
8. Add Toppings: Top with shredded lettuce, crumbled cheese, and a drizzle of sour cream or crema.
9. Garnish: Finish off with avocado slices and fresh cilantro for a burst of color and flavor.
10. Serve Immediately: Enjoy while the tostadas are crispy and fresh!

By following these steps, you’ll create a dish that impresses both visually and gastronomically.