Add the chicken, garlic, olive oil, lime, and spices, to a large bowl or zip-seal bag and stir or shake to combine.
Heat a large pan to medium-high heat. Cook chicken 6-7 minutes per side or until it is no longer pink and the internal temperature of 165 degrees F. Remove from heat and cool for at least 5 minutes. Slice or chop into small cubes.
Combine the chopped tomato, jalapeno, onion, cilantro, and lime juice in a small bowl.
Char tortillas on the stove top over the flame until lightly charred (optional).
Assemble tacos by placing about 1/4 cup of chicken into each tortilla. Top with a few tablespoons of the onion-tomato mixture and a drizzle of cilantro sauce (optional).
Top with Avocados From Mexico homemade guacamole.