Spray bottom of slow cooker with cooking spray.
Place chicken in slow cooker and sprinkle as evenly as possible with Taco seasoning.
Pour 1-½ cups of salsa on top of the chicken.
Cook covered on low for 6-7 hours or high 3-3 ½.
Remove cooked chicken from slow cooker.
Add peppers to slow cooker.
Shred chicken with 2 forks.
Return shredded chicken to slow cooker.
Stir and cook covered on high for about 10 minutes or until heated through.
Spoon about ⅔ of a cup of the chicken mixture down the center of each tortilla and add preferred toppings.
Fold bottom end of tortilla over filling. Fold in sides, leaving top end open. Secure with a toothpick, if necessary.