Season the chicken with the chili powder, ground coriander, salt and pepper. Ensure that the chicken is coated well with the spices.
Add some lard to a medium hot pan and cook the chicken breasts about 2-3 minutes per side (depending on the thickness). Once the chicken is cooked, squeeze 3 of the 4 lime wedges over the chicken and cut into strips.
While the chicken cooks, mash the avocado with a fork and squeeze the remaining lime wedge over it. Season with salt and pepper.
Mix the sour cream and the cilantro.
Assemble the salad: divide the lettuce, tomato, avocado ,and sour cream into two bowls. Top with chicken and sprinkle with the mozzarella cheese. Stir it all together and enjoy!