| Step 1 | 
Bring a pot of water to a boil; add half an onion, 2 whole garlic cloves and the thyme. Cook chicken breast, bone and skin included.  | 
| Step 2 | 
Remove the chicken once cooked through after 20-30 minutes. Discard the onion, herbs and garlic, but set aside one cup of chicken stock. | 
| Step 3 | 
Shred the chicken and set it aside. | 
| Step 4 | 
In a frying pan, add a tablespoon of cooking oil and sauté half an onion coarsely chopped and two garlic cloves until fragrant and caramelized. Add the tomatoes cut into wedges and cook for 2-3 more minutes. Set aside.  | 
| Step 5 | 
Add to a blender one cup of chicken stock, the mole La Costeña and the stir-fried tomatoes, onion and garlic. Blend until smooth. | 
| Step 6 | 
Heat the tortillas in a skillet until soft, and fill each with 2-3 tablespoons of shredded chicken.  | 
| Step 7 | 
Place the filled tortillas in a baking tray and top them with the mole.  | 
| Step 8 | 
Top with the grated cheese and serve immediately.  |