
Simmer the chicken breasts in salted water about 15 minutes until cooked through, then shred with two forks.
Meanwhile, cook the sliced onion in oil over medium heat 5 minutes. Add the garlic for 1 minute.
Blend the tomatoes with 1-2 chipotle peppers (fewer for kids), a spoonful of adobo sauce, and the oregano. Pour into the skillet and simmer 5 minutes.
Stir in the shredded chicken and simmer 3 minutes until saucy.
Warm the tortillas and fill with the chicken, crumbled cotija, and sliced avocado.
Photo: DinnerDrop