3-Ingredient Crock-Pot Chicken Tacos

boneless, skinless chicken breasts

packet low-sodium taco seasoning (see note)

jar of your favorite salsa

For serving: tortillas or taco shells and your choice of optional toppings, such as shredded lettuce, chopped tomatoes, shredded cheese, black beans, corn, chopped avocados or guacamole, reduced-fat sour cream, and hot sauce