In a small cup add the chipotles, ketchup, soy sauce, vinegar, chili powder. Mix to combine and set aside.
Add the oil over medium high heat. Add the onion and sauté until it starts to become translucent. Add the chicken and chipotle sauce and stir to combine.
Cover pot and simmer over medium-low heat until sauce is syrupy. Make sure to stir often to prevent the bottom from burning and sticking.
Garnish with shredded lettuce, chopped tomatoes and avocados. Finish with a squeeze of fresh lime juice and your favorite hot sauce.