Put chicken in a sprayed slow cooker and sprinkle liberally with taco seasoning.
Pour salsa over chicken.
Cook for 3-4 hours on high. Shred chicken with 2 forks in the slow cooker or remove chicken and shred then return to slow cooker to coat with sauce and keep warm.
When chicken is almost done, place zucchini, sweet pepper, tomatoes and onions in a mound on a parchment paper lined sheet pan. Drizzle with olive oil and season well.
Toss around to coat vegetables then spread them out into an even layer. Roast at 400 degrees for 15-20 minutes, until tomatoes have burst and squash has softened
Fry or warm tortillas for wraps, or make into bowls** if desired.
Place lettuce on a plate, in a tortilla bowl** or on a tortilla for a wrap
Top lettuce with shredded chicken and sauce, then roasted vegetables.
Optional: Sprinkle with cheese and serve with a drizzle of Ranch dressing or a dollop of sour cream.