Peel the onions, cut one of them in quarters and the other one in slices. reserve.
Add the quartered onion to a blender, along with with the 2 cloves of garlic, the peeled tomatoes, the chipotle, the cumin, salt, the tomato pure, the vegetable bouillon and blend for 1 minute until smooth.
Add vegetable oil to a skillet, when hot, add the sliced onions, the crushed garlic, and the shredded chicken and saute until the chicken is golden, it will be about 4 minutes in medium heat.
Add the marinade, stir it and let it cook for 5 minutes.
urn off the heat and serve it as desired!